$A$ capacitor of capacity $C_1$ is charged to potential $V_1$ and then disconnected. An uncharged capacitor of capacity $C_2$ is connected in parallel with $C_1$. The resultant potential $V_2$ is
- A$\frac{V_1 C_2}{C_1}$
- B$\frac{C_2}{C_1+C_2}$
- C$\frac{C_1 V_1}{C_2}$
- D$\frac{C_1 V_1}{C_1+C_2}$
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