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Two identical capacitors have the same capacitance \( C \). One of them is charged to potential
\( \mathrm{P} \) \( V_{1} \) and the other to \( V_{2} \). The negative ends of the

W capacitors are connected together. When the positive ends are also connected, the decrease in energy of the combined system is
(a) \( \frac{C}{4}\left(V_{1}^{2}-V_{2}^{2}\right) \)
(b) \( \frac{C}{4}\left(V_{1}^{2}+V_{2}^{2}\right) \)
(c) \( \frac{C}{4}\left(V_{1}-V_{2}\right)^{2} \)
(d) \( \frac{C}{4}\left(V_{1}+V_{2}\right)^{2} \)
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