Two identical capacitors have same capacitance $C$. One of them is charged to the potential $V$ and other to the potential $2V$. The negative ends of both are connected together. When the positive ends are also joined together,the decrease in energy of the combined system is:
- A$\frac{1}{4} CV^2$
- B$2 CV^2$
- C$\frac{1}{2} CV^2$
- D$\frac{3}{4} CV^2$
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