In the circuit shown in figure, four capacitors are connected to a battery. A capacitor is connected to a battery. The force of attraction between the plates when the separation between them is halved
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When separation becomes half $C, Q, E$ becomes $2 C, 2 Q, 2 E$

since $F=\frac{Q E}{2}$ so $F^{\prime}=\frac{2 Q .2 E}{2} F^{\prime}=4 F$

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