Question

1) You have a glass rod that has been rubbed with silk, and a small neutrally-charged aluminum foil ball attached to a thread. You slowly approach the ball with the rod and then make contact between the ball and the rod. Glass tends to acquire a positive charged when rubbed with silk. Based on this information sketch a picture of the final excess charge distributions on the glass rod and aluminum foil ball.

Answer 1

Some charge will transfer from rod to aluminium ball until potential difference between both is zero. When potential difference is zero charge will start transferring.

I have provided 3 figures, last figure is the one asked in the question that is final distribution