A rod made from insulating material carries a net charge
Chapter 18, Problem 18.162(choose chapter or problem)
A rod made from insulating material carries a net charge (which may be positive or negative), whereas a copper sphere is electrically neutral. The rod is held close to the sphere but does not touch it. Which one of the following statements concerning the forces that the rod and sphere exert on each other is true? (a) The forces are always attractive. (b) The forces are always repulsive. (c) The forces are attractive when the rod is negative and repulsive when it is positive. (d) The forces are repulsive when the rod is negative and attractive when it is positive. (e) There are no forces.
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