Explain why a ping-pong ball suspended by a string between balls of an electric machine will vibrate from one ball

Explain why a ping-pong ball suspended by a string between balls of an electric machine will vibrate from one ball to another when it touches one of the balls

When approaching the ball of the conductor of the electrophoretic machine, an induced charge arises in the ball; the charge of the same name with the conductor is on the side of the ball farthest from the conductor and the opposite charge is on the near. The ball will begin to be attracted to the conductor and come into contact with it. After contact, the ball will receive an electric charge and collapse from the conductor. Having touched another ball, the ball will overtake most of the charge for it and swing back. Then he again touches the conductor of the electrical machine, and the process will be repeated.

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