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A capacitor consists of two fixed semicircular plates of radius R and a movable slab...

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A capacitor consists of two fixed semicircular plates of radius R and a movable slab of thickness d and dielectric constant k placed between then The slab can freely rotate about the axis O and practically fills the entire gap between the fixed plates A constant voltage V is maintained between the plates If the torque acting on the dielectric slab when the slab is displaced to an angle 0 as shown k 1 R V nd in the figure due to electrostatic force is t 0 find the value of n 4

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