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 3.

(Detailed Solution Below)

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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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