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) feels no force due to the sphere.
C) is attracted to the sphere.

Question

Quizplus · Accepted Answer

When the charged rod touches the neutral metallic sphere, it transfers some of its charge to the sphere. If the rod was negatively charged, the sphere becomes negatively charged as well, causing the rod to be repelled by the sphere once they are separated.

A Plastic Rod Is Charged Up by Rubbing a Wool