Figure shows three concentric metallic spherical shells. The outermost shell has charge $q_2$, the inner most shell has charge $q_1$, and the middle shell is uncharged. The charge appearing on the inner surface of outermost shell is
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(c)
Suppose a guassian surface passes through conducting shell with radius $\left(r_3\right)$
Flux through it well be zero. So, net charge enclosed must be zero.
$\therefore q_1+q^{\prime}=0$
$q^{\prime}=-q_1$
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