$A$ table tennis ball,which has been covered with conducting paint,is suspended by a silk thread so that it hangs between two plates. One plate is earthed,and the other is connected to a high-voltage generator. This ball:

  • A
    Is attracted towards the high-voltage plate and stays there.
  • B
    Hangs without moving.
  • C
    Swings backward and forward,hitting each plate in turn.
  • D
    Is attracted to the earthed plate and stays there.

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