A metal ball is hanging from the ceiling by a thin thread. The thread is an elec
ID: 1524288 • Letter: A
Question
A metal ball is hanging from the ceiling by a thin thread. The thread is an electrical insulator and any induced electric charges on the metal ball cannot flow through. The metal ball is small and light enough that if an electric force is applied, the ball would move. At first the ball is electrically neutral. If you bring a negatively charged glass rod very close to the metal ball (on a side, not under, not above), but not touching, what would happen to the ball? If you gently touch the ball with the rod what would happen immediately after the touch?
If you bring a negatively charged glass rod very close to the metal ball on a side, not under, not above), but not touching, what would happen to the ball? If you gently touch the ball with the rod what would happen immediately after the touch? o When the rod is not touching the ball, the ball moves towards the rod. Immediately after touching the ball still moves towards the rod. o When the rod is not touching the ball, the ball moves towards the rod. Immediately after touching the ball does not move at all. o When the rod is not touching the ball, ball is repelled by the rod Immediately after touching the ball moves towards the rod o When the rod is not touching the ball, the ball moves towards the rod. Immediately after touching the ball is repelled by the rod. o When the rod is not touching the ball, the ball does not move at all. Immediately after touching the ball moves towards the rod o When the rod is not touching the ball, the ball is repelled by the rod. Immediately after touching the ball is still repelled by the rod.Explanation / Answer
when a negatively charged glass rod is brought close to the ball, a positive charge will be induced on the ball due to induction and it will move towards the rod.
when the glass rod is brought close to the ball, some negative charge will be transferred to the ball and it will repel the rod.
so option (4) is correct
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