An insulating sphere of radius R = 0.10 m has a uniform surface charge density e

Question

An insulating sphere of radius R = 0.10 m has a uniform surface charge density equal to 5.9 mC/m2. A point charge of magnitude 0.71 mC is 0.45 m from the center of the sphere. The magnitude of the force exerted by the sphere on the point charge is 0.024 N.

a)Suppose the charged sphere is made from a conductor, rather than an insulator. 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:

Explanation / Answer

After getting "incorrect" for the answers from "stylus", the correct answers I just got in mastering physics for this exact same problem are,

Part A: less than

Part B: The charge on a conducting sphere will move as far away as possible from the point charge. This results in a reduced force.

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