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*Given ~ *Resistivity = 30 ohm *Length = 2 m *Diameter = 0.6 mm *Temperature = 25°C SOLUTION~ Formula ~ * Resistivity = Resistance ×( Area of cross section /lenth of the wire) *ρ = RA/l *30 = ρ 2/A *Area = Area of circle = πr^2 * radius = Diameter/2 = 0.6/2 = 0.3 *ρ = RA/l *ρ = 30×π(0.3)^2÷2 *ρ = 30×22/7×0.3×0.3÷2 **ρ = 4.24* _= 4.24 Ohm will be the new ρ at temperature 25°C_ HOPE YOU LIKE THIS SOLUTION
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guys ans is 4.24 x 10 ^-6 *take the reference from example 12.5 of ncert page no. 208* Change the diameter mm to m by dividing by 1000 so diameter will be 6 x 10^-4 then change it to radius by dividing it by 2 and put it in the area formula A= πr² then all u have to do is put it in the Resistance formula and ans will be 4.239x 10^-6 so i changed it into 4.24x 10^-6
Are bhai maza hi a gay mam u ar grt mam i could not undrstnd this topic from long time u md it clr ..... Best video on resitivity that evr seen....👏👏 At last tnkx maam❤
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Ma'am u are one of the great teacher on youtube Your teaching method is fantabulous And Answer of the 4 question is 4.23×10^-6 Ma'am plzz tell is that correct?
@@affanff4926 bcz in series it's RS = R1+R2 And in parallel it's 1/rp = 1/R1 + 1/R2 Here 1/something + 1/something is always smaller than adding both those numbers
Mam in the 1 question we have stretched the wire so if we will add another length of wire then will the area of the cross sec get half or not? Becoz we didnt stretch it we had just another piece of the same.... Hope you will clear my doubt
Anushka Singh, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends. Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
Thank you so much for your kind words! We're so happy you enjoy our educational videos and that they've been helpful for you. Keep up the great work and we hope you have a bright future ahead!
Ma'am in the 1st question when ans was 8 ohm then I think that it was correct ✅✔☑because r is directly proportional to l. Hence when l doubled (10cm - 20cm) then r also should be doubled (4ohm-8ohm ) to 8 ohm sahi tha shayd
it is directly proportional... but also u have to keep in mind that length is not the only factor in which resistance depends... you have to consider area too thats why the ans is 16ohms
iam_kanha, Thanks for the reply. Wherever possible, please recommend us to your friends. Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
In Older Slides of Previous Videos , Factors on which Resistance of a Conductor depend :- we studied that , when the length of the wire is doubled or halfed then it's resistance also get doubled or halfed Then why it doesn't applicable in 1st Numerical 15:40
Thanks for your comment! We're glad you're paying attention to the details of our videos. In the numerical you are referring to, the length of the wire is the same but the area of cross section is different. That's why the resistance of the wire changes. We hope this answer was helpful!
Doctor My Aim, Thanks for being active on the channel. Do recommend us to your friends. Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
I have one easy tricks to find new resistance L-10 cm R - 4 ohm Sol:- R'= n2R ( n sq. R ) Here r' is new resistance R'=(2)sq ×4 (here put the value of n is double so I have written 2 ) R'= 4×4 R'= 16
Ananya Dubey, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access. Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
mam i want to say that if length of wire is doubled than its resistance is also double than if length 10 and its double is 20 and resistance 4ohm than it is also double than second wire resistance is 4×2=8ohm but why it is 16ohm because we have learn that when length of wire is doubled than resistance is also double
I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
19:14 Length double Kane se cross section area half ho jayega aur resistance four times hoga na Lekin Google pe to 'resistance bhi double ho jayega' yeh dikha rahe hai Iska actual answer kya hoga Please reply 🙏
ankit bajpai, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends. Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
Thank you for your feedback! We are glad to hear that you were able to answer the question correctly and were happy about it. We understand that mistakes can happen and we hope that our videos have helped you to learn how to answer such questions correctly.
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I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
I have doubt in question 1 ....that resistance is directly proportional to length therefore if length gets double which is 20 CM so resistance should also get doubled which is 2×4 = 8 ohms ..,. ❓❓
Mam aap charge ko small (q) SE represent Karne ko btai hai lekin mere teacher capital (Q) SE represent Karne ko bole hai... Which one is correct Ma'am? Please reply me fast!!!
No worries muskan Q and q both are correct In some books charge is denoted as q while in other books it's Q so both the denotations are correct You can use any one
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
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❤❤❤❤❤❤
Mam, please bring more questions on resistivity. Nice explanation
Me doing the first numerical with mam and suddenly she be like ye pura galat hai bacche exam m yahi mistake kar aate hai 😂😂🥴
Same with me too
Same with me also man
same with me and I have no time tomorrow is my exam 😭😭
Same 😂
Same 😂😂
*Given ~
*Resistivity = 30 ohm
*Length = 2 m
*Diameter = 0.6 mm
*Temperature = 25°C
SOLUTION~
Formula ~
* Resistivity = Resistance ×( Area of cross section /lenth of the wire)
*ρ = RA/l
*30 = ρ 2/A
*Area = Area of circle
= πr^2
* radius = Diameter/2
= 0.6/2
= 0.3
*ρ = RA/l
*ρ = 30×π(0.3)^2÷2
*ρ = 30×22/7×0.3×0.3÷2
**ρ = 4.24*
_= 4.24 Ohm will be the new ρ at temperature 25°C_
HOPE YOU LIKE THIS SOLUTION
No miss
Aapne to lenght ki unit hi na change ku
424.3 *10^-8 will be the answer
Resistive ohm meter Mei Aati hai
@@aanya3062u send the points left side surely u will get the right answer... That is 4.24× 10^ -6...
Okkk
You are one of the best teacher on internet...lots of luv to you from JHARKHAND 💜
Jamshedpur❤
@@GaneshMahato916me palamau
Mera Ghar bhi Jamshedpur m hai but wha rahta nahi hu mai bihar se😀
@@flipperxprem998 OP😎
@@ayushdubey6109 me palamu daltanganj
Best explanation mam...I understand clearly.... What you explain. In this video...thnks mam for helping...❤️
😘
Good job
You understand all things
I asked one question ❓ ohms laws ko universal law kio nahie Khate
Axxa
Please guys share n like this video.
Itne kam views hai and likes bhi. Ases accha todhi lagta hai free ki chez ko bhi use nahi kar rahe ho.
Like karo it motivates them to bring more items.
It's a humble request do like and one share . Please 🙏🙏🙏🙏🙏🙏🙏
Yaa brother.. no one is subscribing this
@@sugyanipriyadarshinimohant9780 are you sis or bro
Where do you live
@@utkarshkumar6480 on Earth
You are right
Answer of H.W. question is 4.239×10-⁶ohm-m
By the way nice explanation
Shruti Birua, Thanks for the reply. Wherever possible, please recommend us to your friends.
@@MagnetBrainsEducation sure
42.42× 10^-5
I think it's 42.42×10^¯7
No 4.239. ×10 -⁶ ohm m is right 👍
guys ans is 4.24 x 10 ^-6
*take the reference from example 12.5 of ncert page no. 208*
Change the diameter mm to m by dividing by 1000 so diameter will be 6 x 10^-4 then change it to radius by dividing it by 2 and put it in the area formula A= πr² then all u have to do is put it in the Resistance formula and ans will be 4.239x 10^-6 so i changed it into 4.24x 10^-6
Nice done
mera bhi same
@@girishchandrasrivastava12thA lol ab toh 11th me aa gaye...Science.leke galti kardi 🥲
Thank you ❤️
@@harmannkaur7438 😅😅
Are bhai maza hi a gay mam u ar grt mam i could not undrstnd this topic from long time u md it clr .....
Best video on resitivity that evr seen....👏👏
At last tnkx maam❤
One of the best physics teacher👍👍
Best teacher love to you from Russia 😁😁😁😁😉😉😉😉😉😉
Thank you so much mam...I'm very grateful to you... You helped me a lot 4 my board exam and as well as NTSE...exams...really thx mam...💖💖💞
Sakshi Jakhar, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
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Sure mam...i'll do this...you are really appreciating
Starting dekh kr mujhe lga ki mai chemistry ki class mai to nhi a gya 😂😂😂😂😂😂
Same
Nahi bahi ye physics hi hai 🤣🤣
Same
Mam your explanation is super 👌👌👌👌
The last question answer is 4.239x10^-6 ohm-m
Swamy Ravula, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
You are brilliant physics teacher in the world you solve my all numerical 👍👍👍👍👍
Really magnet brain play a big role in our life❤️
Thank you so much mam😘😘😘😘😘😘😘😘😘😘😘
You're teaching style is outstanding
Most interesting i m big fan magnet brains all teams ☺️☺️☺️☺️
Mam your 1st question was very helpful 👍👍
U r gr8 mam. Tomorrow is my test . And I am just seeing ur video. And I am 100 percent sure I will get full marks
HW =
resistivity of the metal is 4.24 x 10 ^ -6 ohms meter
Best of luck for tomorrow everyone! Hope everyone passes with best results. 💐💐💐
We're glad you're finding our videos helpful as you prepare for your exams! Wishing you all the best for a successful tomorrow.
@@MagnetBrainsEducation That was unexpected. 😄
@@MagnetBrainsEducation🎉
Wonderful job ma'am
Thank u so much😇😇
GAMING ON, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
Ma'am u are one of the great teacher on youtube
Your teaching method is fantabulous
And
Answer of the 4 question is 4.23×10^-6
Ma'am plzz tell is that correct?
Diksha Yadav, Thank you for your comment. Do recommend Magnet Brains to your friends.
It's answer is 60.75
@@exploringinterest3760 wrong answer babe
@@dikshayadav8914 I think your answer is right cozz I got the same answer 😅
But slightly different because I got 42.39×10^-9
Now I'm a bit confused😶
@@karabikonwar554 😂😂
Maam you are the best 👍🏻👍🏻
Vibha Lal, Thank you for your comment. Do recommend Magnet Brains to your friends.
Make video how to solve numerical of resistivity with power 10 raise to plz help 🙏 me
Bro class 9th ke gravity wale chapter me mam ne btaya tha
You can watch it from there
Yes bro l, agree
You r the best teacher of science ☺☺☺☺
How should two resistors with resistance R1 and R2 ohms be connected to a battery of V volts so that the electric power consumed is minimum?
In parallel
I think I series because P = V²/R
So R should be maximum to get minimum power
@@affanff4926 in parallel
@@keralagamer1174 can u explain
@@affanff4926 bcz in series it's RS = R1+R2
And in parallel it's 1/rp = 1/R1 + 1/R2
Here 1/something + 1/something is always smaller than adding both those numbers
Thank you so much mam😍😍😍
itzz literally so clear explanation
Thnq for wonderful explanation...
You r the one of best teacher ever...❤❤
Mam in the 1 question we have stretched the wire so if we will add another length of wire then will the area of the cross sec get half or not?
Becoz we didnt stretch it we had just another piece of the same.... Hope you will clear my doubt
I think it would be given in the question whether it is streched or another wire added!!
@@Ankit_sharma12. agree with your ans
3 saal ho gaye bhai apki hope ko per mam na diya reply
3 saal ho gaye bhai apki hope ko per mam na diya reply
Mam you are the really best teacher of science
Anushka Singh, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
Amazing session mam... 😀❤️
Thank you so much for your kind words! We're so happy you enjoy our educational videos and that they've been helpful for you. Keep up the great work and we hope you have a bright future ahead!
@@MagnetBrainsEducation thank you so much mam you are so sweet 😊
Ma'am in the 1st question when ans was 8 ohm then I think that it was correct ✅✔☑because r is directly proportional to l. Hence when l doubled (10cm - 20cm) then r also should be doubled (4ohm-8ohm ) to 8 ohm sahi tha shayd
PRIYANSH SINGH, Thanks for being active on the channel. Do recommend us to your friends.
@@MagnetBrainsEducation sure
No
it is directly proportional... but also u have to keep in mind that length is not the only factor in which resistance depends... you have to consider area too thats why the ans is 16ohms
You are right that we have to change cm into m and the answer will be 8. Mere bhi yahi h
Exceptional thanks to you dear mam ...... Thank you so much
Jasmeen Kaur, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
Ye chap. Bahut tuff lgta tha mujhe....but ab sbse easy chap. Koi h sci. Me to ye...Electricity..so thank you dii n brain magnets❣️
U know mam urr explaination makes impossible to turn possible
.thankyou mam
Homework answer - 4.239 × 10^-6
Plz tell me the procedure
No 4.24×10^-2
Catva
mam is there no need to change l from cm to m..?????
4.24x 10^-6 ohm meter
7:30 pe main cheez shuru hai 🤯🤯
I understand all the numericals mam thanks a lot mam 😇😊
Numerical start at 7:30
Homework Answer-423×10^8 ohm metre
Answer of HW question - 42.39x10^-8
iam_kanha, Thanks for the reply. Wherever possible, please recommend us to your friends.
Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
7:30 if you have understood the concept and just want to see the questions then here it is...
I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
@@RohitKUMAR-np8qd kitna paresaan hai bhai tu
Correct bro
In Older Slides of Previous Videos , Factors on which Resistance of a Conductor depend :- we studied that , when the length of the wire is doubled or halfed then it's resistance also get doubled or halfed
Then why it doesn't applicable in 1st Numerical 15:40
Thanks for your comment! We're glad you're paying attention to the details of our videos. In the numerical you are referring to, the length of the wire is the same but the area of cross section is different. That's why the resistance of the wire changes. We hope this answer was helpful!
@@MagnetBrainsEducation ooh how I missed it , Thanks 👍
Thanks mam ☺️, nice session for practice and solving new variety of numericals .
With regards
: KAMLENDRA 😀
Mam you cleared 👍 my all doughts love for you from Kashmir
Doctor My Aim, Thanks for being active on the channel. Do recommend us to your friends.
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Mam thank you so much, hame toh resistivity samajh me hi nhi aa raha tha! But after watching this video the concept of resistivity is clear😎😎😎
Jyoti Raj, Thanks for being active on the channel. Do recommend us to your friends.
4.239×10-⁶ohm metres
If we double length of the wire so why the resistance of the wire is not double???¿¿¿🤔🤔🙄🙄 please answer of this🙏🙏🙏
mam your teaching is too good
I have one easy tricks to find new resistance
L-10 cm
R - 4 ohm
Sol:-
R'= n2R ( n sq. R )
Here r' is new resistance
R'=(2)sq ×4 (here put the value of n is double so I have written 2 )
R'= 4×4
R'= 16
love u mam for clearing my doubt in `rho'🤗
Ananya Dubey, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
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Answer of the homework is 4.5×10^-5............ BTY very nice explanation.
Plz tell how
Umm... its 4.24 × 10^-6
Yes...
7:35 yaha se questions shuru
Do we not have to covert the length from cm to m in first question
Thanks mam please post more
Thanks a lot ma'am for these questions
These questions were really good as they of little bit high level
mam i want to say that if length of wire is doubled than its resistance is also double than if length 10 and its double is 20 and resistance 4ohm than it is also double than second wire resistance is 4×2=8ohm but why it is 16ohm because we have learn that when length of wire is doubled than resistance is also double
I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
If you notice the formula you will find out. Area is divided by 2 after reciprocal 8×2= 16 ohm. Bcoz when length increases then area decreases. Simple
Agar hamna usko stretch kiya ha to uska area be to kam hoga agar ham 10 metre add karta na ki stretch tab 8 ohm hota
Good teaching mam
Very good explain
ation
Excellent 😊 i have shared this video with my all friends
Chal nikal
Crystall clear mam thanks 🙏🏼
Mam aap khule baalo mein bahut aachee dikhti ho !!!❤️
But Tum to dikh hi nhi rahi
@@Pradeep_Yadav1-u6z flirt kar rahe ho 😂
@@jeeyashekhawat3912 soch to nhi rahe the🤓
@@jeeyashekhawat3912 jab bol hi di ho to thoda kar lete hai😁
@@jeeyashekhawat3912 kaha se belonging hai?
Toda jaldi bola kariye bahut lamba lecture ho jata h
WONDERFUL SESSION
CLEARED ALL MY DOUBTS AND QUERIES
THANK YOU MAGNET BRAINS FOR BRINGING SUCH AMAZING CONTENT
BTW MY COMMENT WAS FIRST
19:14 Length double Kane se cross section area half ho jayega aur resistance four times hoga na
Lekin Google pe to 'resistance bhi double ho jayega' yeh dikha rahe hai
Iska actual answer kya hoga
Please reply 🙏
You are one of the best teacher thanks a lot ♥️
Reply mam reply please I have already written one easy tricks tell me that's wrong or right
You are fabulous mam👍
Literally watching this 6 hours before my board exam 😂 2022 term 2
Yess what was your score....
Ans is 4.23×10^-6
Mam plz tell is this ans is correct or not
I will wait for your reply
Mam please try to solve more questions, we expect to solve atleast 10 ques. In 30 min.3 questions in 30 min are not enough .
Mam please take a live class in February because I want to complete my all chapter and ask some doubt and numerical please 🙏🏼🙏🏼🙏🏼🙏🏼🙏🏼
ankit bajpai, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
Get All Classes & Subject Wise playlists here:- www.pabbly.com/out/all-videos-playlist
Homework : --
4.239×10^-6
mera 1st ka Ans Bilkul same aaya tha and I was really happy 😊😊...until she said yehi kiya h na Apne Bilkul galat h Yehi galti krte hain bacche 🙂🙂
Thank you for your feedback! We are glad to hear that you were able to answer the question correctly and were happy about it. We understand that mistakes can happen and we hope that our videos have helped you to learn how to answer such questions correctly.
.........Thank youuuuuuu soooooo muchhhhhh ma'am for these AWESOME SESSION.............
(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤
We're so happy to hear that you're enjoying the videos! Keep up the good work and let us know if you have any questions.
Mam sadar charan spars...aapko...
We are glad to have helped you in your studies and we hope our videos continue to be of assistance to you.
Best explanation of top level
Last question answer
Resistively =423.9×10^-8
dhanraj GADRI, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.
@@MagnetBrainsEducation ok 😁👍
Correct
Actually q1 is one which most students are confused with.
Thanks mam you excellent teacher and you teach in any school or not
Krrish Gupta, Thanks for being active on the channel. Do recommend us to your friends.
dangerous question
Mam you are best teacher
sita kumari, Thanks for being active on the channel. Do recommend us to your friends.
Why we remove row and length in ques 3 when finding Resistance?
Vishambhar Yadav, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.
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Please tell me reason of not using row and length in question 3
Mam 1st ka ab answer 1 ohm aayega
The correct answer of the hw question is
Resistivity =R×A/L
Resistivity = 30×0.2826×10^-⁶/2 [ A =πr^² = 3.14 ×0.09×10^-⁶]
Resistivity=4.239×10^-⁶ohm m
Ma'am aap bhot achha explain krte h
I love ur teaching
Really ma'am
I want to ask a question that....Mujhe samajh Nahi arha hai ki Radius kab lena hai diameter kab lena hai questions Mai??? Or Unki value Kya put krni h???
Great explanation miss
No
Ans:- 4.23×10^-6😅
Best teacher of world. .magnet brains
Kiran Pal, Thanks for the reply. Wherever possible, please recommend us to your friends.
Mam answer 4.24 ×10^-6 ohm meter
I have doubt in question 1 ....that resistance is directly proportional to length therefore if length gets double which is 20 CM so resistance should also get doubled which is 2×4 = 8 ohms ..,. ❓❓
Yes
Helpful video for icse students as well
Jb bich me viedo black nd white ho gyi thi seriously muje lga mere aankho ki roshni chli gyi 😂😂😂
ayush goel, Thanks for the reply. Wherever possible, please recommend us to your friends.
Mam aap charge ko small (q) SE represent Karne ko btai hai lekin mere teacher capital (Q) SE represent Karne ko bole hai...
Which one is correct Ma'am? Please reply me fast!!!
No worries muskan
Q and q both are correct
In some books charge is denoted as q while in other books it's Q
so both the denotations are correct
You can use any one
@@vibhutikhare6298 Thank you mam.
@@MuskanKhatun-hy4pk mam aap boht asha padhate h🙏🙏🙏🙏🙏🙏thank u so much mam
@@trisha5477 glad to know that my lectures are helpful to you
All the best !!
Both correct
Mam aapka bilkul pdhana ni aata..... Nice explanation .. thank you.. are bhai comment krenge isliye likha h