A solid conducting sphere of radius 10cm is enclosed by a thin metallic shell of radius 20cm. A charge q=20µC is given to the inner sphere. The heat generated in the process is

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zero

24 J

9 J

12 J

answer is B.

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Detailed Solution

$\begin{array}{l} H = U_{i} - U_{f} = \frac{q^{2}}{2 C_{1}} - \frac{q^{2}}{2 C_{2}} \\ C_{1} = 4 π \in_{0} R_{1}, C_{2} = 4 π \in_{0} R_{2} \end{array}$

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