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Q.

Two conducting concentric hollow spheres have radii a and 2a. The inner shell has net charge Q on its surface. The outer shell is neutral. If the outer shell’s is connected to the earth the net heat generated is

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a

14πε0Q24a

b

14πϵ0Q22a

c

14πϵ0Q2a

d

Zero

answer is C.

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Detailed Solution

Heat Generated=Uf-Ui

Ui=Uself energy=KQ22a

after earthing, charge on outer sphere (inner side) will be -Q and on inner sphere (outer side) will be Q.

Uf=U'self energy=KQ22a+KQ24a

Heat generated = KQ24a

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