A neutral ball is suspended by a string.

Question

A positively charged insulating rod is placed
near the ball, which is observed to be attracted to the rod.
Why is this?
1. The ball becomes negatively charged by
induction.
2. The string is not a perfect conductor.
3. The number of electrons in the ball is
greater than in the rod.
4. The ball becomes positively charged by
induction.
5. There is a rearrangement of the electrons
in the ball.

Answer 1

There is a rearrangement of the electrons
in the ball. When induction starts to occur, the rearrangement of the electrons to get near the side of the ball which a positive charge is present creates a visible attraction between the two objects.