I think this is one of the rare occurrences, where one of my favorite professors, Mr. Verma, has made a mistake in his book. If you go to Feynman lectures - Chapter 43 -Diffusion -> Drift velocity, the last paragraph explains what's wrong with this logic. Completely agree that we are dealing with classical assumptions here. But under these assumptions, the correct answer is -eEtau/m and not -0.5eEtau/m. Details: In the book, drift velocity is calculated as the 'average distance traveled between the collision'(L)/'average time taken between the collision'(tau) and then L = 0.5 a(tau)^2. This is an error. 'L' should have been 0.5a[t1^2 +t2^2+t^3....]/N. notice, this is NOT equal to tau^2 [tau^2 would be (t1+t2+.../N)^2]. Here t1, t2, t3 represent the time between various successive collisions.
As Prof said in video that he has assumed velocities to be equal than mean relaxation time for all of them will also be equal so t1=t2=t3=…..tn then (nt)^2=n{(t)^2}
I think what sir said is right.Because the part we are studying is based on assumptions and the answers vary as the assumtions vary. Those who just want to cram the formula and are not interesting in gaining knowledge of the true origin of the formula will not believe in what sir said and would try to relate it with other books.
Drift veocity is average of drift velocity of large number of electrons and for each electron a is qE/m this can be checked in "drift velocity and collision time" by Donal M Title American General of physics. Lastly in my humble opinion in science we are all learning it is about betterment not about being right and wrong.
@@ajay2552 no bro.....I am shocked...and feel sorry for those poor students...I am paying more attention because it really hard to dislike this video......
Sir if Kirchhoff's law in current electricity are only applicable for conservative fields then how do we apply it in case of inductor ? (As magnetic field of inductor is non conservative ) I am in doubt. PS:- I was a Hindi Medium student and after heard that you have translated Concept of Physics in Hindi too then I was very happy. Thanks a lot Sir.
Actually university physics describes it better. You dont apply kirchoffs loop rule there but the total potential gain and drop anywherr in circuit equals the potential across inductor
SIR, i am a student of class 11 preparing for JEE How should we manage the couching teacher constantly telling us not to think extra or out of the box..........as I get 100s of questions everyday.........this thing is constantly affecting my questioning ability??????? big fan of yours and your practical teaching methords
It depends on how the drift velocity is defined in wiki and few texts it is defined as : drift velocity is the average velocity attained by charged particles, such as electrons, in a material due to an electric field. under a force, the velocity attained is 'at' for the eqation 'v = u +at' with u as 0. in between every collition it is this velocity that is attained by the electron, many such collisions and many such in between period, the average of it is 'a*tou' where tou = average time between collitions. so by definition Vd = a*tou what it is not is the distance traveled by electron by time over long period. u can seperately define it that way but the two definations are different. this second way of definition is used by H.C. Verma which makes sense, but as it is different from the first one, it will give different results. also it becomes a little bit complicated to get exact expression and needs bit more assumption in the second way as the focus is on distance traveled, you use 's = ut + 1/2 a t^2' to calulate the distance traveled between each collitions. so 's1 = 1/2 a t1^2' now add all this s1 s2 upto sn to get '1/2 a * (t1^2 + t2^2 + ....)/(t1 + t2 + ....)' and now to simplify it further u have to use more assumption like t1 = t2 = .... = tuo. this is again not necessary as it can also be assumed that t1, t2, ..... so may be taken from some other destribution like normal destribution which may make better sense but will give different result(final expression). the first feinition cuts out all this complications and straing way defines as the velocity attained making the expression easy to calculate, but we can not use it to calculate the distance covered by electron, the secaond way is focused to calculate the distance drifted by electron but is difficult to calculate and needs more assumptions like distribution of the time intervels. but then again as H C Verma said if u want to calculate rigorously than we have to use quantum mechanics as electrons are not tiny balls and we can not apply kinematics in this simplified form.
@@samirmondal4624 Mr HC verma is wrong on this one. Almost everyone, every scientist who actually do and measure drift velocities and people of other universities know that 2 shouldnt be in the denominator
Sir, I am Satyam Kumar. Q. Why Christmas bulbs( having same resistance) glow with more or less brightness?? ( There will be also a equal drop in voltage) Sir PLZZ help me out this .
sir i am a 10th student , i just wanna post a comment here because it would feel like ive shared something with you i know no one will reply ,but just wanna express i am not that of a weak or mid student i am finely good in subjects ,i understand the concepts and until i do not i try to find everything about it but when i try to solve questions i cannot solve them , i want to go to iit crack jee no one has forced me to take this as my career ive chosen this path,if in future i become a little better student i ll reply to myself clarifying this silly query of mine thankyou bye sir
The drift velocity of free electron in a conductor is Vo when the current I is following in it. If both radius and current are halved, the drift velocity will be
But sir the problem still remains the same that why NCERT used v=u+at and you used s=ut+1/2at^2? I think the 2nd equation is more correct to calculate drift velocity because avg. Velocity is total displacement upon total time but if we go by ncert derivation we would find that the meaning of there drift velocity comes out to be the velocity at any instant but the avg. For all electrons in the wire,but by your derivation it comes out to be the average velocity for a single electron over a long Period of time so not just the expression the whole meaning of drift velocity is changed??it's so confusing
Sir kaash aap jaise teacher mere jaise baccho ko mil jaate toh hum log physics ko enjoy karte na ki physics main yeh khojte ki iss chapter se kitne marks ka question aaya hain jee and boards main
Yes sir it is absolutely right that someone take average velocity of whole element as same under someone take some different average velocity is like that this make changes for thanks for the clarity you have given to a sir thank you so much
But at last finally the factor affecting it is really matters question are sometimes very in different equations but the proportionality and the factors affecting the 120 1 physical quantity by another is very very essential in Physics
Sir is assuming the average drift distance of one electron to be same as every other electron which is wrong. 2 shouldn't come in the denominator. Sir's formula undervalues the result massively
Sir I am Anand Raj from Bihar my question is In a merry go round a boy is sitting and is in uniform circular motion. There are two observer A and B. A is observing the boy from outside marry go round while B is observing the boy from the centre of merry go round. Consider a same case of uniform circular motion of ball tierd with string and the observer are same. What will be the observation of A and B in both case. give reason. Give answer in context of centripital and centrifugal forces.
Sir its a humble request.. kindly make short videos regarding Physics optional in CSE.. fundamentals of quantum mechanics.. hermitian operators etc. PleSe Sir consider this..👏🏻
As simple as that you can't assume , collision time for each individual collision is tau, because it is simply illogical and only a hypothetical situation. You have to admit that.
Electric Field Lines Ki Direction Me Chalne Par Potential Decrease Hota Hai.. Feel Karne Ke Liye Kr Liye Socho, Positive Charge Se Negative Charge Ki Or Jaane Par Potential Decrease Hota Hai And We Know That, Is Case Me Electric Field Positive Charge Se Negative Charge Ki Or Hogi.. Ek Statement Hota Hai , "the direction of Electric Field is , in which direction electric Potential Decreases at Max rate".
Father of physics harish chandra verma ....naman sir ji 😊 i want to meet you face to face sir ...😊 sir kya aap kabhi guwhati mei pragjotish collage mei aya the ??? North east of india please sir reply ...☺
Sir I am preparing for neet ....... I have a doubt ...... I asked this doubt from many of the teachers but could not find satisfaction........ My question is...... The electrons move from negative potential to positive potential .... So why the current flow from high potential to low potential..... I wanted to know how the mechanism is done when a conductor is attached to the battery
Actually , questions like this tells you that science cannot explain everything ... No one knows why .. Even Richard Feynman gave a detailed explanation of this question during his interview talk .
@@You12783 if science has no answer to such type of questions then there must be something to rule all. It might be the True God. Then why scientists do not accept the fact?
I think, energy is playing important role here, to bring two north or south poles of of magnet ... the nature or we want to apply more energy so that is why it is not favoured... You may ask why the energy required is more to bring north- north pole.... I think it is because the magnetic field lines are in opposite directions.. if we put N-N Poles . it is difficult to overcome. Then,, how magnetic field lines are there... First of all they are imaginary lines that we have created to study them clearly... Then how can we say it is 100% true... Yes,, we are not saying it is all true, if any other theory comes apart from this which is able to Explain the properties of magnet better than this, we will apt to new theory..... Physics is nothing but a subject we have created to make of life simpler by studying the nature.. and getting apted to it and to find how to live by using the components which are available in nature and universe.. The nature and universe behaves themself in their way by spending less energy and to get more stability (equilibrium)
Sir my quantum mechanics account had been logged out temporarily..... and I am not able to login again....there is some problem..... please help me sir....
sir it is said by einstein that nothing (information) cant travel at speed of light ... but take this self thought experiment say i am traveling at 1/2 the speed of light and an astroid is travelling at a speed of 3/4 the speed of light but in opposite direction to me ... so from my frame of reference wouldn't that astroid be moving at a speed greater than speed of light?? im a 12th student , and know nothing about theory of relativity yet but i have heard it at many places like the concept of spacetime , gravity isnt a force and etc ... but it doesn't makes sense to me...
Sir I have confusion.That why electric current flows when electrons moves in the opposite site?I asked this question to many teachers but no one can't explain it.Sir it is my request to you please explain it.What current actually.
Here negative sign indicates the direction of acceleration of electrons which are moving in opposite direction of uniform electric field. In Sir HC Verma book the equation of drift velocity is derived by using first equation of kinematics .
Sir I have a question ... We all know that sun exerts a constant gravitational force on our earth. But if thus was so then the orbit of revolution of earth around sun would have been circular. But according to Kepler's laws it is elliptical.... What is the fact behind it.. Sir please make a video on this..
Assume this space to be a fabric Higher the mass of an object, higher the depression it creates on the fabric and thus the objects with comparatively lower mass starts revolving around it under the influence of the object with bigger mass And now your answer When earth reaches at a place which is closest to the sun, it experiences maximum amount of gravitational force, thus the revolutional force of the earth gets maxed out (resulting higher speed of revolution) due to which it surpasses the sun from a certain distance, as it goes far, the potential energy in it starts to recede and thus gravitational pull of sun again starts increasing it's influence on earth and it's path gets bent
Another simple explanation might be that Newtonian forces act on both bodies and the sun is displaced from it's original position now so the earth exists its older circular path and enter a new circular path. Also this Newtonian force exists not only due to earth but also other heavy planets so this Sun's displacement is significant than considered in only Earth plus Sun system. Thus the path formed is an ellipse which you can get mathematically. If this explanation is satisfactory at a basic level of understanding hit the thumb's up!
Sir please sir draw the magnetic field lines due to moving of single electron I searched it several times on google, RUclips, and asked to my teachers, friends but they couldn't draw the magnetic field due to single electron Plzzzz sir
If electron is not accelerating...and moving straight then magnetic field lines must be circular around electron(direction of magnetic field can be determine by you left hand!! Put you thumb in the direction of electron and curl you fingers..! If electron is moving in in a circular path..then magnetic field is along the axis of rotation..! Actually this all applies on current! But Since there's analogy,you can obey ..
Current is scalar quantity , and if the direction of current is specified in any case, we mean it is opposite to flow of electrons , but it is not vector as triangular law of vector addition can’t be applied
I think this is one of the rare occurrences, where one of my favorite professors, Mr. Verma, has made a mistake in his book. If you go to Feynman lectures - Chapter 43 -Diffusion -> Drift velocity, the last paragraph explains what's wrong with this logic.
Completely agree that we are dealing with classical assumptions here. But under these assumptions, the correct answer is -eEtau/m and not -0.5eEtau/m.
Details:
In the book, drift velocity is calculated as the 'average distance traveled between the collision'(L)/'average time taken between the collision'(tau)
and then L = 0.5 a(tau)^2. This is an error.
'L' should have been 0.5a[t1^2 +t2^2+t^3....]/N. notice, this is NOT equal to tau^2 [tau^2 would be (t1+t2+.../N)^2]. Here t1, t2, t3 represent the time between various successive collisions.
So do you mean that drift velocity cannot be calculated accurately by using formula?
@@Ramesh-ps7yn Yes jee does not follow this formula
@@Ramesh-ps7yn jee follow ncert formula for no confusion.
Please share the link of video of professor Feynman, in which he taught about drift velocity.
As Prof said in video that he has assumed velocities to be equal than mean relaxation time for all of them will also be equal so
t1=t2=t3=…..tn then (nt)^2=n{(t)^2}
Sir please make video lectures of your books hcv 1 &2☺️☺️☺️
It is not possible bro...
Will be uploaded soon
Yes please sir.
yes sir pls
I always learn something new from you . ❤️👏🌠
Thanx a lot sir
I was totally confused after reading notes and from your book
Having same doubt but your lecture cleared it ❤️❤️❤️❤️
I think what sir said is right.Because the part we are studying is based on assumptions and the answers vary as the assumtions vary.
Those who just want to cram the formula and are not interesting in gaining knowledge of the true origin of the formula will not believe in what sir said and would try to relate it with other books.
Thanks to the one who asked the question.
Gratitude to sir🙏, He answered it.🙏🙏
Sir plz make a video series step by step on the entire syllabus of 11 and 12 plzz
Bilkul sir please
Iit kanpur padhate hai aacharya jii iitians ko he is not have free time
@@VivekBhaiyaJii He is retired
@@hassonaa335 yar Mujhe inse padhna tha iit me yar.
@@VivekBhaiyaJii YOU TUBE SE PADH LO
Wow Hc verma 😍 my doubt clear
You are LEGEND of physics ❤️❤️
Finally I got this after many Gmail's and comments on fb thank you sir
Nice Sir! Welcome to RUclips🔥🔥🇮🇳🇮🇳
Such Simplicity.... Sir I became ur fan... You have a truly beautiful mind and smile 😊
Drift veocity is average of drift velocity of large number of electrons and for each electron a is qE/m
this can be checked in "drift velocity and collision time" by Donal M Title American General of physics.
Lastly in my humble opinion in science we are all learning it is about betterment not about being right and wrong.
Well I also had confusion in the expression for drift velocity in conept of physics . Thanks sir for addressing it.........
Dhanyavad sir for this awesome explaination aap online physics Padahná shuru kar dijeya sir .
I am astonish to see the legends here who CLICK dislike button, no doubt they know more physics then "HC VERMA SIR".
sala irodov hoga
I don't know why do you pay more attention to 52 dislikes and not 2700 likes.
@@ajay2552 no bro.....I am shocked...and feel sorry for those poor students...I am paying more attention because it really hard to dislike this video......
@@ROHITMISHRA-jl5lw i agree....bro....
@@visheshraj724 🤣🤣
Sir if Kirchhoff's law in current electricity are only applicable for conservative fields then how do we apply it in case of inductor ? (As magnetic field of inductor is non conservative )
I am in doubt.
PS:- I was a Hindi Medium student and after heard that you have translated Concept of Physics in Hindi too then I was very happy. Thanks a lot Sir.
aisa to maine socha hi nahi
Actually university physics describes it better. You dont apply kirchoffs loop rule there but the total potential gain and drop anywherr in circuit equals the potential across inductor
You can get potential across inductor by applying energy conservation
But your English is fluent 😮
you had better apply faraday's law in that case.
SIR, i am a student of class 11 preparing for JEE
How should we manage the couching teacher constantly telling us not to think extra or out of the box..........as I get 100s of questions everyday.........this thing is constantly affecting my questioning ability???????
big fan of yours and your practical teaching methords
Exactly Bhaiya, I am having the same problem 😢
It depends on how the drift velocity is defined
in wiki and few texts it is defined as : drift velocity is the average velocity attained by charged particles, such as electrons, in a material due to an electric field.
under a force, the velocity attained is 'at' for the eqation 'v = u +at' with u as 0. in between every collition it is this velocity that is attained by the electron, many such collisions and many such in between period, the average of it is 'a*tou' where tou = average time between collitions.
so by definition Vd = a*tou
what it is not is the distance traveled by electron by time over long period. u can seperately define it that way but the two definations are different.
this second way of definition is used by H.C. Verma which makes sense, but as it is different from the first one, it will give different results. also it becomes a little bit complicated to get exact expression and needs bit more assumption
in the second way as the focus is on distance traveled, you use 's = ut + 1/2 a t^2' to calulate the distance traveled between each collitions. so 's1 = 1/2 a t1^2' now add all this s1 s2 upto sn to get '1/2 a * (t1^2 + t2^2 + ....)/(t1 + t2 + ....)'
and now to simplify it further u have to use more assumption like t1 = t2 = .... = tuo. this is again not necessary as it can also be assumed that t1, t2, ..... so may be taken from some other destribution like normal destribution which may make better sense but will give different result(final expression).
the first feinition cuts out all this complications and straing way defines as the velocity attained making the expression easy to calculate, but we can not use it to calculate the distance covered by electron, the secaond way is focused to calculate the distance drifted by electron but is difficult to calculate and needs more assumptions like distribution of the time intervels.
but then again as H C Verma said if u want to calculate rigorously than we have to use quantum mechanics as electrons are not tiny balls and we can not apply kinematics in this simplified form.
I was also in doubt...
But now clear..... thanks a lot sir
Sir u r god of physics. Really
Not at all
😂😂😂he is excellent teacher but not god of physics . physics is very complicated and intresting subject .
I don't know why but I feel motivated to study physics after watching hc verma sir lectures
sir but which formula should we use in competitive exams?
Stupid indian exams
And still teacher crosses me for writing -eEt/2m instead of m
No one is greater than an IIT KANPUR PHYSICS HOD..... HC VERMA
@@samirmondal4624 Mr HC verma is wrong on this one. Almost everyone, every scientist who actually do and measure drift velocities and people of other universities know that 2 shouldnt be in the denominator
Is God book ncert says that
"2 is not present in denominator" then, it is not present 100%
@@jeeaspirant7229 god book ncert my was ,yes entrance follows ncert knowledge but ncert 10 percent facts are wrong
@@neeraj8278 sorry
But I completely disagree you .
Their might be some printing mistakes, but concept it contain is 💯% correct
Sir, I am Satyam Kumar.
Q. Why Christmas bulbs( having same resistance) glow with more or less brightness?? ( There will be also a equal drop in voltage)
Sir PLZZ help me out this .
sir i am a 10th student , i just wanna post a comment here because it would feel like ive shared something with you i know no one will reply ,but just wanna express i am not that of a weak or mid student i am finely good in subjects ,i understand the concepts and until i do not i try to find everything about it but when i try to solve questions i cannot solve them , i want to go to iit crack jee no one has forced me to take this as my career ive chosen this path,if in future i become a little better student i ll reply to myself clarifying this silly query of mine thankyou bye sir
All the best
Sir even i have a doubt regarding rolling without slipping in rotational motion please explain
The drift velocity of free electron in a conductor is Vo when the current I is following in it. If both radius and current are halved, the drift velocity will be
2Vo
But sir the problem still remains the same that why NCERT used v=u+at and you used s=ut+1/2at^2? I think the 2nd equation is more correct to calculate drift velocity because avg. Velocity is total displacement upon total time but if we go by ncert derivation we would find that the meaning of there drift velocity comes out to be the velocity at any instant but the avg. For all electrons in the wire,but by your derivation it comes out to be the average velocity for a single electron over a long Period of time so not just the expression the whole meaning of drift velocity is changed??it's so confusing
Finally i got cleared my doubts from last one years i was studying wrong this one
Sir please explain full concept of potential difference.
Sir but jee if we get numerical based type then we have to one answer only so what should we opt for
Sir kaash aap jaise teacher mere jaise baccho ko mil jaate toh hum log physics ko enjoy karte na ki physics main yeh khojte ki iss chapter se kitne marks ka question aaya hain jee and boards main
Yes sir it is absolutely right that someone take average velocity of whole element as same under someone take some different average velocity is like that this make changes for thanks for the clarity you have given to a sir thank you so much
But at last finally the factor affecting it is really matters question are sometimes very in different equations but the proportionality and the factors affecting the 120 1 physical quantity by another is very very essential in Physics
Sir is assuming the average drift distance of one electron to be same as every other electron which is wrong. 2 shouldn't come in the denominator. Sir's formula undervalues the result massively
Sir I am Anand Raj from Bihar my question is
In a merry go round a boy is sitting and is in uniform circular motion. There are two observer A and B. A is observing the boy from outside marry go round while B is observing the boy from the centre of merry go round. Consider a same case of uniform circular motion of ball tierd with string and the observer are same. What will be the observation of A and B in both case. give reason.
Give answer in context of centripital and centrifugal forces.
Sir its a humble request.. kindly make short videos regarding Physics optional in CSE.. fundamentals of quantum mechanics.. hermitian operators etc.
PleSe Sir consider this..👏🏻
Sir can you please make a video explaining and deriving ohm's law
Sir you are inspiration of many students 🙏
sir please make a playlist for class 11 cbse [physics]
Sir please make a video on average relaxation period on current electricity.... Class 12
Thanku sir this is also my doubt.
Ya same here
As simple as that you can't assume , collision time for each individual collision is tau, because it is simply illogical and only a hypothetical situation. You have to admit that.
Sir so which of of these formulas should we we use in competitive exams??
-Et/m
Thank you so much sir for your approximation technique and it gives the approximation and clarity to our concepts
Thank you so much sir so much sir for giving clarity
Sir so much confusion in derivation of electric potential due to a point charge !! Sir plz make a. Video on this topic !!!
dV/dr = E
@@shreekrishna4594 ty ..but isme minus sign bhi ata h..vo kyu ata h...what does it signify??
Electric Field Lines Ki Direction Me Chalne Par Potential Decrease Hota Hai..
Feel Karne Ke Liye Kr Liye Socho, Positive Charge Se Negative Charge Ki Or Jaane Par Potential Decrease Hota Hai And We Know That, Is Case Me Electric Field Positive Charge Se Negative Charge Ki Or Hogi..
Ek Statement Hota Hai , "the direction of Electric Field is , in which direction electric Potential Decreases at Max rate".
@@mr.lonely1213 electric field and drift velocity of electron are in opposite direction
Father of physics harish chandra verma ....naman sir ji 😊 i want to meet you face to face sir ...😊 sir kya aap kabhi guwhati mei pragjotish collage mei aya the ??? North east of india please sir reply ...☺
How electric field of static charge is different from that of produced by time varying magnetic field?
Sir EMF source can transfer maximum e.power to load only when load resistance become equal to the source resistance why
My means that when R>r and R
Sir I am preparing for neet ....... I have a doubt ...... I asked this doubt from many of the teachers but could not find satisfaction........
My question is...... The electrons move from negative potential to positive potential .... So why the current flow from high potential to low potential.....
I wanted to know how the mechanism is done when a conductor is attached to the battery
These is the Effective Mass of electron.
From The Resonanc
The slow physics is good physics- Ravi sir
Sir please explain theory of relativity
Namaste Sir...I am Kumkum Padhi from Odisha ....I have doubt in Electric potential due to a dipole ...pls make a short video ...thank you
I just learned expression of drift velocity by tution. And im here im in 11th maharashtra board
Sir plz make video on nlm for STD 11 in easy it makes caous in academic studies
second is correct because we are talking about average velocity. so( initial velocity + final velocity)/2
= (0+ eET/m)2 = eET/2m
सर, क्या आप गुरुत्वाकर्षण के कारण एक संक्षिप्त वीडियो बना सकते हैं
I agree
Sir please
Thank you so much sir... I had also same doubt...
I had same doubts thank u for clearing
Sir can you please explain quantum fluctuation
Sir please explain why two north poles of a magnet repels each other. Upload a video to understand this concept.
Actually , questions like this tells you that science cannot explain everything ... No one knows why .. Even Richard Feynman gave a detailed explanation of this question during his interview talk .
@@You12783 if science has no answer to such type of questions then there must be something to rule all. It might be the True God. Then why scientists do not accept the fact?
@@SivaKumar-mu5pj "we dont know something" that doesn't justify the fuckery of God . Do you even know about the topic of "quartz" ?
@@omshree2448 "we don't know..." - The people who says this are laggards.
I think, energy is playing important role here, to bring two north or south poles of of magnet ... the nature or we want to apply more energy so that is why it is not favoured...
You may ask why the energy required is more to bring north- north pole....
I think it is because the magnetic field lines are in opposite directions.. if we put N-N Poles . it is difficult to overcome.
Then,, how magnetic field lines are there... First of all they are imaginary lines that we have created to study them clearly... Then how can we say it is 100% true... Yes,, we are not saying it is all true, if any other theory comes apart from this which is able to Explain the properties of magnet better than this, we will apt to new theory.....
Physics is nothing but a subject we have created to make of life simpler by studying the nature.. and getting apted to it and to find how to live by using the components which are available in nature and universe..
The nature and universe behaves themself in their way by spending less energy and to get more stability (equilibrium)
Sir my quantum mechanics account had been logged out temporarily..... and I am not able to login again....there is some problem..... please help me sir....
What? 😂
Sir please clarify the doubt of wheatstone network
So nice explanation sir
But why then Richard feynman says that -eEt/2m is wrong and the other one is right though the books use an erronius way to obtain the formula
-eEt/m ?
Sir plz, class 12 & 11 ka most important topic ka ek series banaiye.... Plz Sirr🙏
Super Sir Ji...... Happy Teachers Day Sir Ji 🙏🙏🙏🙏🙏🙏🙏🙏
Sir I am confused in electrostatic potential between Potential energy. I am from Bihar(Munger) . So please give a lecture on this topic.
Hiii sir can you explain projectile motion pleaseeeeee
You are the great
Thankyou sir, 🙏!! I aslo had this one!
sir it is said by einstein that nothing (information) cant travel at speed of light ...
but take this self thought experiment
say i am traveling at 1/2 the speed of light
and an astroid is travelling at a speed of 3/4 the speed of light but in opposite direction to me ...
so from my frame of reference wouldn't that astroid be moving at a speed greater than speed of light??
im a 12th student , and know nothing about theory of relativity yet but i have heard it at many places like the concept of spacetime , gravity isnt a force and etc ... but it doesn't makes sense to me...
Sir aap physics waallah ke app pe padhaiiiee na ❤️🙏
Sir I have confusion.That why electric current flows when electrons moves in the opposite site?I asked this question to many teachers but no one can't explain it.Sir it is my request to you please explain it.What current actually.
This is actually a traditional sign convention nothing to do with electron direction
You are great
Sir par Q me use karne ka time
answer will get change so which should be used
Sir if potential increase will mobility decrease
Sir polarisation of light pe video banao
Splendid explanation sir
Brilliant explanation
Must listen to HC Verma on Valmiki
Here negative sign indicates the direction of acceleration of electrons which are moving in opposite direction of uniform electric field.
In Sir HC Verma book the equation of drift velocity is derived by using first equation of kinematics .
sir how can we send you our doubts?
Sir what happens if a question come from purely based on
this formula in jee ...what should we do??
The one in NCERT
Sir I have a question ...
We all know that sun exerts a constant gravitational force on our earth. But if thus was so then the orbit of revolution of earth around sun would have been circular. But according to Kepler's laws it is elliptical....
What is the fact behind it..
Sir please make a video on this..
Assume this space to be a fabric
Higher the mass of an object, higher the depression it creates on the fabric and thus the objects with comparatively lower mass starts revolving around it under the influence of the object with bigger mass
And now your answer
When earth reaches at a place which is closest to the sun, it experiences maximum amount of gravitational force, thus the revolutional force of the earth gets maxed out (resulting higher speed of revolution) due to which it surpasses the sun from a certain distance, as it goes far, the potential energy in it starts to recede and thus gravitational pull of sun again starts increasing it's influence on earth and it's path gets bent
@@justmypet8060 thanku sir...I got it👍👍👍
Another simple explanation might be that Newtonian forces act on both bodies and the sun is displaced from it's original position now so the earth exists its older circular path and enter a new circular path. Also this Newtonian force exists not only due to earth but also other heavy planets so this Sun's displacement is significant than considered in only Earth plus Sun system. Thus the path formed is an ellipse which you can get mathematically. If this explanation is satisfactory at a basic level of understanding hit the thumb's up!
Sir concept of physics ki second edition Hindi kab aayegi
Sir will u please upload a video on magnetic dip
Ncert uses -eEt/m , which one should i use ?
Sir please sir draw the magnetic field lines due to moving of single electron
I searched it several times on google, RUclips, and asked to my teachers, friends but they couldn't draw the magnetic field due to single electron
Plzzzz sir
If electron is not accelerating...and moving straight then magnetic field lines must be circular around electron(direction of magnetic field can be determine by you left hand!! Put you thumb in the direction of electron and curl you fingers..!
If electron is moving in in a circular path..then magnetic field is along the axis of rotation..!
Actually this all applies on current! But Since there's analogy,you can obey ..
Sir please make videos in ur book hc verma 1&2 part
Please tell us ...
Why semiconductors are more conducting with increase in temperature
As e crosses fermi energy level after thermal agitation
So what we should do in MCQ entrance exams?
Pls make vedio of kinematics
Sir AAP please bhotiki ki samajh bhag 2 in hindi me publish kijiye please reply sir
Hindi me
why is the drift velocity and the speed of current are not same?
Sir please make an video on magnetic field
Current किस प्रकार की quentity h
Scalar or vector ?
Current is scalar quantity , and if the direction of current is specified in any case, we mean it is opposite to flow of electrons , but it is not vector as triangular law of vector addition can’t be applied
Sir please make bhoutiki ki samajh part 2 book for neet jee hindi medium aspirants 🙏🙏🙏🙏
Sir I have asked same thanks sir for explaining it
How to ask to sir
Sir plz make vedios on shortcuts for class 12
I have got the question of my answer
Thankyou