To understand interactions between a grounded conductor and a charged ball that

Question

To understand interactions between a grounded conductor and a charged ball that is repeatedly brought into contact with it. 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 (Figure 1) . 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? Select the expected behavior. Select the expected behavior. 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)? Select the best description. Select the best description. 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? Select the expected behavior. Select the expected behavior. 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? Select the expected behavior. Select the expected behavior. strongly repelled strongly attracted weakly attracted weakly repelled neither attracted nor repelled

Explanation / Answer

both ends neutral strongly attracted neither attracted nor repelled

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