00:01
Hello friends, we are here to solve a problem in which the length of the potentiometer wire is 600 cm and a current of 400 millamper is flowing in it.
00:10
When a cell of emf 2 volt and internal resistance 10 -oom is balanced on this potentiometer, the balance length is found to be 500 cm.
00:18
The resistance of potentiometer wire will be how much? so, in order to solve such kind of problem, first of all, let us write whatever given in the problem.
00:26
I can say that given now we have been provided with the length which is 600 % obviously and a current of 400 sorry 40m.
00:37
I if you go ahead then you can say that of the battery or you can say such as is 2 volt and resistance that is internal resistance which is which should be represented with a small hour internal resistance equals 10 oh okay so so now i can say that this problem is pretty easy to solve if you understand this problem well.
01:03
First of all, you need to understand one more thing that the balance length, which i am denoting with l0, is 500.
01:10
Now, what i can do in this problem is that i can use some basic concepts.
01:15
Like, first of all, you need to understand that emf of external circuit equals potential gradient.
01:23
Let me write it for you otherwise you will be confused in this very problem.
01:28
I think that you are known to this very quantity that is potential gradient...