00:01
All right, so we have a spherical little conducting cavity with a charge of plus q placed in it, and it is surrounded by a neutral conducting sphere.
00:14
And so we want to know what's the total surface charge on the interior surface on the conductor? well, the conductor, since it is a conductor, means electrons can move freely, is going to line this interior surface with negative charges so that it cancels out the electric field in this the electric field in that region will be zero, which means that the charge on the interior has to be equal and opposite of the point charge value.
00:41
Because that way, if you use gauss's law and we draw the field here, we know the field has to be zero inside a conductor.
00:51
And so the, you know, galses law says the electric field times the area is the total charge enclosed, divided by epsilon or not.
00:58
What the electric field in the conductor is zero, then that means that the total charge in close has to be zero.
01:03
So, like, right around this region, it's going to surround it with negative charges...