0:00
Hi everyone.
00:01
We have a question in which given that the number density of free electrons in a copper conductor.
00:06
So that means in the question we have given the number density.
00:15
Let's say the number density is represented by of electron, let's say capital n, which is given that 8 .5 multiplied by 10 to the power 28 per meter cube.
00:29
Then we have also given that this wire is basically 3 meter long.
00:35
So this wire is we can say that the length of this wire and the length of this wire is l and which is equal to 3 meter long.
00:43
And also we have given the area of cross section of wire.
00:48
So area is also given which is a and it is equals to 2 multiplied by 10 to the power minus 6 meter square.
00:58
And it is carrying a current of 3 ampere.
01:01
So we can say that the current which is i is equal to 3 ampere.
01:07
So we need to find the drift velocity of the electron.
01:11
So we need to find the drift velocity in this case.
01:14
So let's see how can we do the question? so drift velocity which is nothing, it is represented by bd.
01:23
We need to find in this case.
01:25
So for finding the drift velocity, we can say that the drift velocity of the electron the drift velocity of electron is nothing it is just represented by we can say that it is we can say that the drift velocity is nothing it is equals to vd which is equal to i divided by number of electrons multiplied by e multiplied by a where e is the charge on an electron and the charge on an electron is nothing it is equal to 1 .6 into 10 to the power minus 19 coulum.
02:05
So we know the values of all the parameters.
02:08
So we can just put these values...