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The electric field at point P just outside the outer surface of a hollow spherical conductor of inner radius 10 cm and outer radius 20 cm has magnitude 445 N/C and is directed outward. When an unknown point charge Q is introduced into the center of the sphere, the electric field at P is still directed outward but is now 165 N/C.
(a) What is the net charge on and enclosed by the outer spherical surface before Q is introduced?
C
(b) What is charge Q?
(c) After Q is introduced, what is the charge on the inner surface of the conductor?
(d) What is it on the outer surface?
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