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Two thin concentric hollow conducting spheres of radii $R_1$ and $R_2$ bear charges $Q_1$ and $Q_2$ respectively. If $R_1 < R_2$, then the potential of a point at a distance $r$ from the centre $(R_1 < r < R_2)$ is

  • A

    $\frac{1}{{4\pi {\varepsilon _0}}}.\frac{{{Q_1} + {Q_2}}}{r}$

  • B

    $\frac{1}{{4\pi {\varepsilon _0}}}.\left( {\frac{{{Q_1}}}{r} + \frac{{{Q_2}}}{{{R_2}}}} \right)$

  • C

    $\frac{1}{{4\pi {\varepsilon _0}}}.\left( {\frac{{{Q_1}}}{{{R_1}}} + \frac{{{Q_2}}}{{{R_2}}}} \right)$

  • D

    $\frac{1}{{4\pi {\varepsilon _0}}}.\left( {\frac{{{Q_1}}}{{{R_1}}} + \frac{{{Q_2}}}{r}} \right)$

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