Question: Negative charge -Q is distributed uniformly over the surface of a thin spherical insulating shell with radius R. Calculate the force (magnitude and direction) that

Negative charge -Q is distributed uniformly over the surface of a thin spherical insulating shell with radius R. Calculate the force (magnitude and direction) that the shell exerts on a positive point charge q located
(a) a distance r > R from the center of the shell (outside the shell) and
(b) a distance r < R from the center of the shell (inside the shell).

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