A metal rod A and a metal sphere B, on insulating stands, touch each other as shown in Figure Q20.12. They are origi- nally neutral. A positively charged rod is brought near (but not touching) the far end of A. While the charged rod is still close, A and B are separated. The charged rod is then withdrawn. Is the sphere then positively charged, negatively charged, or neutral? Explain.

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FIGURE Q20.12 XXXXX A B