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(A) When an insulator (dielectric) plate enters the capacitor,the capacitance $C$ increases. Since $Q = CV$,the charge on the plates increases. This i

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First flows from $A$ to $B$ and then from $B$ to $A$

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(A) When an insulator (dielectric) plate enters the capacitor,the capacitance $C$ increases. Since $Q = CV$,the charge on the plates increases. This increase in charge causes a change in the electric field between the plates. As the plate enters,the electric flux increases,leading to a displacement current in the direction of the electric field (from positive plate $A$ to negative plate $B$). As the plate leaves,the capacitance decreases,the charge decreases,and the electric flux decreases,causing the displacement current to flow in the opposite direction (from $B$ to $A$). Therefore,it first flows from $A$ to $B$ and then from $B$ to $A$.

An insulator plate is passed between the plates of a capacitor. The displacement current

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