Loss of energy when two identical capacitors at V1 and V2 are joined

1. A.
   $\frac{1}{4}C\left(V_1^2+V_2^2\right)$
2. B.
   $\frac{1}{4}C\left(V_1^2-V_2^2\right)$
3. C.
   $\frac{1}{4}C\left(V_1+V_2\right)^2$
4. D.
   $\frac{1}{4}C\left(V_1-V_2\right)^2$

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1. A.
   $\frac{1}{4}C(V_1^2 - V_2^2)$
2. B.
   $\frac{1}{4}C(V_1^2 + V_2^2)$
3. C.
   $\frac{1}{4}C(V_1-V_2)^2$
4. D.
   $\frac{1}{4}C(V_1+V_2)^2$

Tap an option to check your answer.