Q.

Two conducing concentric hollow spheres of radii a and 2a respectively are shown in the diagram. The inner shell has net charge Q on its surface. The outer shell is neutral. If the outer shell is connected to the earth the heat generated through the connecting wire is

Moderate

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a

Zero

b

14π∈0.Q22a

c

14π∈0.Q24a

d

14π∈0.Q2a

answer is C.

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Detailed Solution

Outside energy =14π∈0Q22×2a will become zero as the shell is earthed. This energy appears as heat

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