A plastic rod is charged up by rubbing a woolcloth, and brought to an initially

Question

A plastic rod is charged up by rubbing a woolcloth, and brought to an initially neutral metallic sphere. It isallowed to touch the sphere for a few seconds, and then isseparated from the sphere by a small distance. After the rod isseparated, the rod
is repelled by the sphere, feels no force due to the sphere, or is attracted to the sphere Thank you A plastic rod is charged up by rubbing a woolcloth, and brought to an initially neutral metallic sphere. It isallowed to touch the sphere for a few seconds, and then isseparated from the sphere by a small distance. After the rod isseparated, the rod
is repelled by the sphere, feels no force due to the sphere, or is attracted to the sphere Thank you

Explanation / Answer

When the rod touches the sphere, it transfers some charge to thesphere... the same kind of charge that is on the rod. Since the rodand sphere each have the same kind of charge, the rod will then be repelled by the sphere(like charges repel).

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