Question

Question: A solid spherical plastic ball was rubbed with wool in such a way that it acquired a uniform negative charge all over the surface. Make a sketch showing the polarization of molecules inside the plastic ball, and explain briefly.

Short answer

The net field inside the ball is zero and thus there will be no polarization inside the ball.

Step-by-step solution

Given data

A rod with uniformly distributed positive charge.

Gauss' law

Electric field in a region not enclosing any charge is zero.

Determination of the polarization inside the ball

Since the charges are all over the surface, the net field inside the ball is zero. Hence in the absence of any external field, there will be no polarization inside the ball.