A capacitor is made of two circular plates of radius R each, separated by a distance d << R . The capacitor is connected to a constant voltage. A thin conducting disc of radius r<< R and thickness t <<r is placed at the center of the bottomed plate. Find the minimum voltage required to lift the disc if the mass of the disc is m.
Text Solution
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As shown in figure, the disc is in touch with the bottom plate. The electric field on the disc is 
therefore, charge 
transferred to the disc
Force acting on the disc, 
If the disc is to be lifted, 
i.e., 
(for minimum V)
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