An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are respectively
a. +q, -q.
b. -q, +q.
c. +q, +2q.
d. +2q, +q.
e. +3q, 0.
C
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