A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius

A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius `2a` and outer radius `3a` as shown in figure. Find the amount of heat porduced when switch is closed `(k=1/(4piepsilon_0))`

A. `(Kq^(2))/(2a)`
B. `(Kq^(2))/(3a)`
C. `(Kq^(2))/(4a)`
D. `(Kq^(2))/(6a)`

A solid conducting sphere of radius a having a charge q is surrounded by a concentric conducting spherical shell of inner radius `2a` and outer radius

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