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$\frac{1}{4\pi \varepsilon_0} \left( \frac{Q_1 + Q_2}{r} \right)$
- 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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