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Q.

Figure shows a solid metal sphere of radius a surrounded by a concentric thin metal shell of radius 2a. Initially both are having charges Q each. When the two are connected by a conducting wire as shown in figure, then amount of heat produced in this process will be :
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a

KQ28a

b

KQ24a

c

KQ22a

d

KQ26a

answer is B.

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Detailed Solution

Ui=KQ22a+KQ24a+KQ22a=5KQ24a   AND 
Uf=K(2Q2)4a=KQ2a   Heat produced= UiUf=KQ24a

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