Question: Fast please . Example 1.20 : An electrostatic voltmeter has two parallel plates, one moving and other fixed. The force exerted on moving plate is

Fast please Fast please . Example 1.20 : An electrostatic voltmeter has two parallel

. Example 1.20 : An electrostatic voltmeter has two parallel plates, one moving and other fixed. The force exerted on moving plate is 4x10 N when 20 kV voltage is applied between the plates. Find the change in capacitance for a movement of 1 mm of the movable plate. The radius of movable plate is 50 mm and air is used as a dielectric

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