Chapter 19, Problem 12PCE

Predict/Explain Suppose the charged sphere in Quick Example 19-10 is made from a conductor, rather than an insulator. (a) Do you expect the magnitude of the force between the point charge and the conducting sphere to be greater than, less than, or equal to the force between the point charge and an insulating sphere? (b) Choose the best explanation from among the following:

1. I.              The conducting sphere will allow the charges to move, resulting in a greater force.
2. II.            The charge of the sphere is the same whether it is conducting or insulating, and therefore the force is the same.
3. III.         The charge on a conducting sphere will move as far away as possible from the point charge. This results in a reduced force.