Electric field direction | Electric charge, field, and potential | Physics | Khan Academy
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- Опубликовано: 28 июл 2016
- In this video David explains how to determine the direction of the electric field from positive and negative charges. He also shows how to determine the direction of the electric force on a charge in an electric field. Created by David SantoPietro.
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How do you know that the electric field is pointing inward on an electric charge? I can't find one person who can answer this question. Everyone just believes this to be the case.
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9:07 consider that the type of field created was created by a positive charge so the negative charge will be attracted by the positive charge and deflected by positive charge
how does the electric potential change along the direction of the net electric field?
9:25 = doubt clear => neither of this two test charges created this electric field. it created by bunch of (+ve charge ----------> or by bunch of -ve charge) now you can see easily dire. of Fe
the farther the test charge is, the less electric force it gets, so does electric field equation only applies to a certain distance?
Theoretically, it can be applied up to infinity but practically yes it equation only applies up to some certain region.
Thank❤
i wish I see, or talk with the narrator !
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what happen if we use negative test charge insist of positive ?? when you find the electric field of positive and negative charge.
So, electrons in a cooper wire flow opposite to electric field or dipole moment. Is that correct? Please help clarify this for me.
If we take the test charge as a negative one ...... the definition of electric field lines in both the cases will contradict itself and we'll get the definition the other way around . 😕
Ik that is exactly my doubt
Say convention
That is why the test charge is always a small "positive"
what if its a negative test charge for the 1st part wouldnt that change everything
Why test charge is taken positive
Sir 1 question( yea i know its silly 😶)
When our teacher teached potential difference in our class he said tht when 1 joule of work is done to bring 1 coloumb of *positive charge from infinity to a point in an electric field, then the potential of that point is said to be 1 volt
Now my question is why it should be positive charge and why not negative? How will we bring tht positive charge from infinity
Does God exist? Well, we have khan academy
no sound
m
What if we keep negative charge as reference test charge for both cases. Then the line direction changes. So what is the correct one?
Please reply asap.
Nothing would change. A negative test charge always moves AGAINST the direction of the electric field. So in the case of the positive field you'd say that since the negative charge is moving towards the centre then the field direction must be the opposite, away from the centre (correct). In the case of the negative, since the negative test charge is moving away from the source, the direction of the electric field field be towards the source. Why did we decide that negative moves the opposite way? Just convention
Sumedha Soorada we assume that the test charge is positive always
Sorry, but there is written "Electric field direction | Electric charge, field, and potential" in the title, however you didn't speak about electric potential in this video. Did you?
There's a reason that the title of this video is separated by vertical lines. The first part of the title, "Electric field direction", tells you what the video is about; the second part, "Electric charge, field, and potential", tells you which series of videos it is part of; the third part tells you the academic subject; and the fourth part tells you that the video comes from Khan Academy.
Electric charge, field,and potential is just a series in which there is a video of Electric field.. Well you can look up for other videos in this series..
What if the test charge is negative?Plz answer...
Suman limbu test charge is considered positive always
Varsha Paliwal why
Why?
Suman limbu Then all the results would be opposite.
@@suman5416 test charges are considered positive because it's just easier to think about that way. Sure you could arbitrarily have a test charge to be negative, but then you would basically have to redefine, say, the electron to have a positive charge. Again, "positive" and "negative" are just words. We arbitrarily pick whats positive and what's negative
"Line of force gives direction of acceleration and not that of velocity " what does this means n signifies ?
It means that the force and acceleration are working in the same direction because F=ma
Is electric force is always in outward direction?
What if you started the video with a negative charge instead of a positive charge?
Ns
Anyone here in 2024
4:30 finally
thank you mister
Thank you!
is that your surname
?
@@iexplainjokestomakethemles1560 no, that's his username