A positively charged rubber rod is moved close to a neutral copper ball that is

Question

A positively charged rubber rod is moved close to a neutral copper ball that is resting on a nonconducting sheet of plastic.

With the rod still close to the ball, a metal wire is briefly connected from the ball to the earth and then removed. After the rubber rod is also removed, describe the distribution of charges (if any) on the copper ball.

Match the words to the appropriate blanks.

1. __________ from the earth are _______ by the region of _________ charge on the ball and flow onto the ball, giving it a net ______ charge.

2. When the rod is removed, this net charge distributes _______ over the ______ of the ball.

attracted

uniformly

positive

electrons

unevenly

negative

repelled

surface

interior

protons

Explanation / Answer

1. electrons from the earth are negative by the region of positive charge on the ball and flow onto the ball, giving it a net positive charge.
2. When the rod is removed, this net charge distributes uniformly over the surface of the ball.

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