Two spherical conductors $A$ and $B$ of radii $a$ and $b$ $(b > a)$ are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then the equivalent capacitance of the system is
AIIMS 2017, Medium
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All the charge given to inner sphere will pass on to the outer one. So capacitance that of outer one is $4\pi {\varepsilon _0}b$.
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