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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
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As the Sum of Charges remain Same

Initial Sum = 3q - q

= 2q

So Answer will Be +q , +q

Here the Sum is also q + q

= 2q

So

+q, +q
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