A solid metal sphere of radius r is inside a metal concentric spherical shell of inner radius 2r and outer radius 3r. A charge is place on the solid metal sphere and it is found that the potential at its surface is V1 (at r) and that the potential at
the outer surface of the spherical shell is V3 (at 3r). In terms of V1 and V3, what is the potential at the inner surface of the metal shell (at 2r)?
a. 3V1/2 b. V3
c. V1
d. 2V3/2
Answer: b
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