A conducting ball hangs from the ceiling with a flexible insulating string. Init
ID: 1999515 • Letter: A
Question
A conducting ball hangs from the ceiling with a flexible insulating string. Initially, the ball is fixed, and a positively charged small conducting sphere is placed near it shown in the figure. What happens if the ball is released (allowed to move) while still hanging from the ceiling? What happens if the ball is released (allowed to move) while still hanging from the ceiling, but only after the positively charged small conducting sphere is allowed to make contact with the ball? If the ball were made of an insulating material (say, a plastic ball), what would you expect to happen in the similar situation as 1)? What do you expect to happen in 1)-3) above, if the positively charged small conducting sphere is replaced with a negatively charged small conducting sphere? Assume that the absolute values of the charge on the sphere do not change. If the string hanging the ball is conducting and is (electrically) connected to the earth, then what difference do you expect from the situation 1) and 2)?Explanation / Answer
a)
negative charges accumulate towards the positive charge side and Positive charges accumulates on the other side. hence the sphere experience small electric force which cause the sphere to moves slightly towards the positive charged ball.
b)
when the ball is touched with the sphere , it aquires some positive charge , hence the sphere feels repulsive electric force which makes it to moves away from the charge slightly.
c)
if the ball is insulating, the sphere will not experience any force.
d)
positive charges accumulate towards the negative charge side and negative charges accumulates on the other side. hence the sphere experience small electric force which cause the sphere to moves slightly towards the positive charged ball.
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