Solve this:
Q.88. The heat generated in the circuit after closing the switch is

(1) C V 2 2
(2) C V 2
(3) 2 C V 2
(4) Zero

dear student
initial potential energy of the capacitor = 1/2 CV2
finally the negative plate of capacitor become positive charge  
initial charge on capacitor plate= q=-CV
final charge=q=+CV total charge flown = 2q=2CV \
work done by battery= q(V) where q= total charge flown through battery 
so  W= 2CV*V= 2CV2

as there is no change in the energy of capacitor so the total work done by battery is released in the form of heat energy

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