A small conducting sphere of radius $r$ is lying concentrically inside a larger hollow conducting sphere of radius $R$. The bigger and smaller spheres are charged with $Q$ and $q$ ($Q > q$) and are insulated from each other. The potential difference between the spheres will be?

Question

$\frac{1}{4\pi \varepsilon_0} \left(\frac{q}{r} - \frac{q}{R}\right)$

$\frac{1}{4\pi \varepsilon_0} \left(\frac{q}{R} - \frac{Q}{r}\right)$

$\frac{1}{4\pi \varepsilon_0} \left(\frac{q}{r} - \frac{Q}{R}\right)$

$\frac{1}{4\pi \varepsilon_0} \left(\frac{Q}{R} + \frac{q}{r}\right)$

Solution

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