This problem explores the behavior of charge on grounded conductors. We take as

Question

This problem explores the behavior of charge on grounded conductors. We take as an example a long conducting rod suspended by conducting wires that are connected to ground. Assume that the rod is initially electrically neutral. For convenience, we will refer to the left end of the rod as end A, and the right end of the rod as end B . In the answer options for this problem, "strongly attracted/repelled" means "attracted/repelled with a force of magnitude similar to that which would exist between two charged balls."

A small metal ball is given a negative charge, then brought near (i.e., within about 1/10 the length of the rod) to end A of the rod. What happens to end A of the rod when the ball approaches it closely this first time?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled

Now consider what happens when the small metal ball is repeatedly given a negative charge and then brought into contact with end A of the rod.

After a great many contacts with the charged ball, how is any charge on the rod arranged (when the charged ball is far away)?

positive charge on end B and negative charge on end A
negative charge spread evenly on both
negative charge on end A with end B remaining neutral
both ends neutral
positive charge spread evenly on both

How does end A of the rod react when the (re)charged ball approaches it after a great many previous contacts with end A?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled

How does end B of the rod react when the charged ball approaches it after a great many previous contacts with end A?

strongly repelled
strongly attracted
weakly attracted
weakly repelled
neither attracted nor repelled

Explanation / Answer

Part D How does end B of the rod react when the chargedball approaches it after a great many previous contacts with endA? Select the expected behavior.

neither attracted norrepelled

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