to its original position 6-20 The capacitance of a variable air capacitor changes linearly from 50 to 364 pF during a rotation from 0° to 180°. When set at 75°, a potential difference of 400 V is maintained across the capacitor. What is the direction and magnitude of electrostatic torque experienced by the capacitor? *6-21 An uncharged conducting coborical chall of mace m flante with one fourth of