4. Two metal spheres are identi- cal. They are electrically neutral and are touc

Question

4. Two metal spheres are identi- cal. They are electrically neutral and are touching. An electrically charged ebonite rod is then brought near the spheres without touching them, as the drawing shows. After a while, with the rod held in place, the spheres are separated, and the rod is then removed. The following statements refer to the masses mA and me of the spheres after they are separated and the rod is removed. Which one or more of the statements is true? (a) ma me (b) mA mB if the rod is positive (c) mA me if the rod is positive (d) mA mB if the rod is negative (e) mA me if the rod is negative

Explanation / Answer

When a positively charged rod is placed near the spheres, electrons are attracted to sphere closer to the rod, so the mass of mA gets very slightly greater. When a negatively charged rod is placed there, electrons are repelled away from the closer sphere toward mB, so the mass of mB gets very slightly greater.

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