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Physics, 22.02.2020 02:58 AT3P

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.

I know the answer is A, but I don't understand why. how do we know that the sphere and the rod have the same charge? What does it mean to be insulated from the ground?

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