A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is ismilarly charged to a potential difference 2V. The charging battery is now disconnected and the capacitors are connected in parallel to each other in such a way that the poistive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is

Options

A. zero
B. `(3)/(2) CV^(2)`
C. `(25)/(6) CV^(2)`
D. `(9)/(2) CV^(2)`

Answer

B

Explanation

`U=(1)/(2)CV^(2)=(1)/(2)(3C)V^(2)=(3)/(2)CV^(2)`.