Physics - Electrostatics Question with Solution | TestHub

With switch S open potential of inner sphere is same as that of point at distance $\frac{3R}{2}$ from centre

When switch S is closed, potential of inner sphere becomes zero

With switch S closed charge on inner sphere is $\left(-\frac{\mathrm{Q}}{2}\right)$

With switch S closed charge on inner sphere is $(-\mathrm{Q})$