A capacitor C is charged to a potential V by a battery. It is then disconnected from the battery and again connected with its polarity reversed to the battery

Options

A. `0.5CV^(2)`
B. `CV^(2)`
C. `2CV^(2)`
D. None of these

Answer

c

Explanation

The battery needs to supply 2CV charge to reverse the polarity. Energy stored remains same hence work done by the battery
`(W_(b)=(2CV)V=2CV^(2))` is lost as heat in recharging.