A 5 kg ball hangs from the ceiling by a thread the walls of, Ask an Expert

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A 5 kg ball hangs from the ceiling by a thread. The walls of the room are 5 m apart and they are made of metal and charged up so that a potential of 100,000 V are between them.The ball moves so that the thread makes a 30 degree angle to the vertical. What is the charge on the ball?

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