Home Physics Electrostatics Potential & Capacitance Grouping of Capacitor The capacities of two conductors are $C_1$ a…
Physics Electrostatics Potential & Capacitance Grouping of Capacitor Single Correct MCQ
Published on: September 12, 2026

The capacities of two conductors are $C_1$ and $C_2$ and their respective potentials are $\vec{V}_{1}$ and $V_{2}$ . If they are connected by a thin wire, then the loss of energy will be given by

A
$\frac{C_1 C_2 (V_1 + V_2)}{2(C_1 + C_2)}$
B
$\frac{C_1 C_2 (V_1 - V_2)}{2(C_1 + C_2)}$
C
$\frac{c_1 c_2 (V_1 - V_2)^2}{2 (c_1 + c_2)}$
D
$\frac{(C_1 + C_2)(V_1 - V_2)}{C_1 C_2}$

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Text Solution

Verified by Experts
The correct answer is:
C

Initial energy $U_i = \frac{1}{2} c_1 V_1^2 + \frac{1}{2} c_2 V_2^2$ ,

Final energy $U_{f} = \frac{1}{2} (c_{1} + c_{2}) v^{2}$ (where $V = \frac{C_1 V_1 + C_2 V_2}{C_1 C_2}$

Hence energy loss $\Delta U = U_i - U_f = \frac{C_1 C_2}{2(C_1 + C_2)} (V_1 - V_2)^2$

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