Two identical capacitors, have the same capacitance $C$. One of them is charged to potential $V_1$ and the other to $V_2$. The negative ends of the capacitors are connected together. When the positive ends are also connected, the decrease in energy of the combined system is
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Initial energy of combined system
$U_{1}=\frac{1}{2} C V_{1}^{2}+\frac{1}{2} C V_{2}^{2}$
Final common potential, $V=\frac{V_{1}+V_{2}}{2}$
Final energy of system,
$U_{2}=2 \times \frac{1}{2}\left(\frac{V_{1}+V_{2}}{2}\right)^{2}$
Hence loss of energy $=U_{1}-U_{2}=\frac{1}{4} C\left(V_{1}-V_{2}\right)^{2}$
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