A plastic rod is charged up by rubbing

By Allen Kazadi

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod:

A) is repelled by the sphere.

B) is attracted to the sphere.

C) feels no force due to the sphere.

Answer:

A) is repelled by the sphere.

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