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Electrostatic Potential and Capacitance
Two bar magnets are quickly moved towards a metallic loop connected across a capacitor ‘C’ as shown in the figure. Predict the polarity of the capacitor.
Left face of the coil will act as North Pole and right face as South Pole so as to oppose the current induced in the coil. As seen from left, the direction of the current in the coil will be anti-clockwise. 
That is, plate of the capacitor A will be positive and plate B will be negative.
Upper plate is positive and lower plate is negative.
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