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A capcitor is made of two circular palte...

A capcitor is made of two circular paltes of radius R each, separated by a distance `dltltR`. The capacitor is connected to a constant voltage. A thin conducting disc of radius `r ltlt R` and thickness `t ltlt r` is placed at a center of the bottom plate. Find the minimum voltage required to lift the disc if the mass of the disc si m.

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