Question

A neutral Ping Pong ball hangs from the ceiling by a thread. A person rubs a rubber rod with animal fur and then touches the Ping Pong ball with the rubber rod. After that, what is the charge of the Ping Pong ball?

Answer 1

When the rubber rod is rubbed with animal fur, the rod becomes negatively charged (as the electrons are transferred from the fur to the rod);

Then the negatively charged rod touched the neutral ping pong ball, the negative charge also distributed over the ball. it also make the ping pong ball negatively charged.

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Actually the neutral ball have equal amount of positive and negative charge. If we only bring the negative charged rod near to ping pong ball (without touch) the positive charge comes near the rod side and negative charge away from that side.  

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