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  4. An insulator plate is passed between the plates of a capacitor. Then current

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Q. An insulator plate is passed between the plates of a capacitor. Then currentPhysics Question Image

Bihar CECEBihar CECE 2008Electrostatic Potential and Capacitance

Solution:

As insulator plate is passed between the plates of the capacitor, its capacity increases first and then decreases as the plate slips out. As a result, positive charge on plate $A$ increases first and then decrease, hence, current in outer circuit flows from $B$ to $A$ and then from $A$ to $B$.