Charging a Conducting Rod previous | 5019 | arging a Conducting Rod Part A A sma

Question

Charging a Conducting Rod previous | 5019 | arging a Conducting Rod Part A A small metal ball is given a negative charge, then brought near (Le, within about 1/10 the length of the to end A of the rod (Figure 1). What happens to end A of the rod when the ball approaches it closely rod) Hints This problem explores the behavior of charge on conductors. We take as an example a long conducting rod suspended by insulating strings. Assume that the rod is initially electrically neutral. For 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 we O It is strongly repelled O It is weakly atracted O It is weakly repelled Figure 1-tof 1 My Answers Give Up Now into contact with end A of the rod Part B After a great many contacts with the charged ball, how is the charge on the rod arranged (when the charged ball is far away)? There is positive charge on end B and negative charge on end A

Explanation / Answer

Before "a great many" contacts, the rod was neutral and hence both positive and negative charges were evenly spread.

a) When you bring a negatively charged body near to end A, it will bring positive charge near end A and will push negative charge at end B due to Induction. End A is positively charged and therefore there will be a weak attraction (option 3).

(b) After a "great many contacts" , negative charge of metal ball will be transferred to the rod. Now rod is negatively charged and metal ball is far away, so no induction. Negative charge will spread evenly at both ends, Option (2).

(c) because rod is now negatively charged, there will be a strong repulsion. Induction woulnd't be that Strong.
Option (1).

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