Consider two concentric conducting spheres. The outer sphere is hollow and initially has a charge `-7Q` on it. The inner sphere is solid and has a charge `+2Q` on it.
a. How much charge is on the outer surface and inner surface of the outer sphere.
b. If a wire is connected between the inner and outer sphere, after electrostatic equilibrium is established how much total charge is on the outer sphere? How much charge is on the outer surface and inner surface of the outer sphere? Does the electric field at the surface of the inside sphere change when the wire is connected?
c. We return to original condition in (a). We now connect the outer sphere to ground with a wire and then disconnect it. How much total charge will be on the outer sphere? How much charge will be on the inner surface and outer surface of the outer sphere?

Options

A. `-2Q, -7Q`
B. `+2Q -9Q`
C. `-2Q, -5Q`
D. `+2Q, +5Q`

Answer

C