Medium
$A$ parallel plate capacitor of capacitance $C$ is connected to a battery and charged to a potential difference $V$. Another capacitor of capacitance $3C$ is similarly charged to a potential difference $3V$. The charging battery is then disconnected and the capacitors are connected in parallel to each other in such a way that the positive terminal of one is connected to the negative terminal of the other. The final energy of the configuration is
- A$\frac{3}{2} CV^2$
- B$8 CV^2$
- C$\frac{13}{2} CV^2$
- D$18 CV^2$
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