00:01
Hello students, so our question is a cavity of radius r, so we have given a cavity of radius r inside a solid dielectric sphere.
00:08
We have given a solid dielectric sphere, okay, of density b and its density is p.
00:17
Volumes are density is p.
00:19
Okay, and the cavity of radius r is present inside it.
00:27
And the distance between the center of the sphere and cavity is a, the distance.
00:33
Given to us is a and then electron is kept inside the cavity and angle 0 450 as shown.
00:41
So how long will electron tag to tuss the sphere again? let's solve this.
00:47
So the general formula for the electric field intensity at any point inside the cavity is e is equals to rho a divided by 3 epsilon knot and this is directed along op.
01:05
The direction is opi directed along op and what is the p the density okay so force acting on electron is opposed to electric field that is f is equals to e that the charge on electron e capital e that is electric field strength and cause 45 degree because this is the angle even towards 45 degree in the equation.
01:39
So this is equals to e, capital e, divided by root two, because the value of cos 45 is root 2.
01:45
So this is the force acting on the electron...