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A capacitor is made of two circular plates of radius \( R \) each, separated by a distance \( dR \). The
\( \mathrm{P} \) capacitor is connected to a constant voltage. A thin

W conducting disc of radius \( r \ll R \) and thickness \( tr r \) is placed at the centre of the bottom plate. Find the minimum voltage required to lift the disc if the mass of the disc is \( m \).
(a) \( \frac{\sqrt{m g d}}{\pi \varepsilon_{o} r^{2}} \)
(b) \( \sqrt{\frac{m g d}{\pi \varepsilon_{o} r}} \) (c) \( \sqrt{\frac{m g d^{2}}{\pi \varepsilon_{o} r^{2}}} \)
(d) \( \sqrt{\frac{m g d}{\pi \varepsilon_{o} r^{2}}} \)
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