Two spheres of radii $R_1$ and $R_2$ have the same initial charge $q$. They are connected by a copper wire. After they are disconnected,the potential of each sphere is $V$. What was the initial charge $q$ on each sphere?
- A$\frac{V}{k}(R_1 + R_2)$
- B$\frac{V}{2k}(R_1 + R_2)$
- C$\frac{V}{3k}(R_1 + R_2)$
- D$\frac{V}{k}\frac{R_1 R_2}{R_1 + R_2}$
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