00:01
So in that case you can see that that is your first sphere, okay? and that first sphere having a radius, we are considered that is a a.
00:09
There is a one more sphere outside of this.
00:14
And we are consider the sphere having a radius is a b, and there are one more thing, that is a one more sphere outside of this.
00:25
So there are three spheres are from one by one with radius a, b and c.
00:32
According to that situation, he says initially that body having a charge plus 2q.
00:38
Due to that amount of a charge 2q, due to a induction, the amount of an inner side of that, that is a minus of a 2q, and initially that is a minus q.
00:49
So due to that minus 2q, it will be add on a plus 2q.
00:53
So final charge becomes a q.
00:55
Okay? so all the things are clear now.
00:58
Now, dear students, first of all, we consider that what is the surface charge density...