A variable air capacitor used in a radio tuning circuit is made of Nsemicircular plates, each of radius Rand positioned a distance dfrom its neighbors, to which it is electrically connected. As shownin Figure P25.5, a second identical set of plates is enmeshed withthe first set. Each plate in the second set is halfway between twoplates of the First set. The second set can rotate as a unit.Determine the capacitance as a function of the angle of rotation 0,where 0 = 0 corresponds to the maximum capacitance.Figure P25.5

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