00:01
All right, so let's say we have an insulating sphere that has a positive charge at the center, but then it has a negative charge, negative q, distributed throughout the volume.
00:11
It has a radius r.
00:13
And so we want to know what is the electric field outside the sphere.
00:17
So according to gauss's law, the electric field is going to be zero because the net charge, like the enclosed charge of a gaussian surface drawn outside the sphere is zero.
00:30
And then for part b, we want to know what is the electric potential outside the sphere.
00:40
So this v is just going to have to be constant because it's going to be the electric field is zero, like i said.
00:47
So we can just take it to be equal to the point at infinity, which will be zero.
00:52
So that's that.
00:54
And then the electric field inside the sphere at a distance r less than r...