A table tennis ball covered with a condu...

A table tennis ball covered with a conducting paint is suspended by a silk thread so that it hangs between tow metal plates. One plate is earthed, when the other plate is connected to a high voltage generator, what will happen to the ball.

is attracted to the high voltage plate and stays there

hangs without moving

swings backward and forward hitting each plate in turn

is repelled to the earthed plate and stays there

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The correct Answer is:

When the other plate is connected to the high voltate generator, the negative charge induced on the ball cause attraction. When it strikes the +ve plate charge distribution again takes place. This causes repulsion. Hence, the ball swings backward and forward hitting each plate in turn.

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