Question: A metal sphere is grounded via a single wire. One end of a plastic rod is given a positive charge and held near the sphere.

A metal sphere is grounded via a single wire. One end of a plastic rod is given a positive charge and held near the sphere.

(a) If the ground wire is removed while the rod and sphere are near each other but have not touched, is there an electric force between the two? Why or why not?

(b) If the rod end is brought in contact with the sphere and then the ground wire is removed, is there an electric force between rod and sphere after they are separated? Why or why not?

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