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Q.

Plates of a parallel plate capacitor are connected to the terminals of a battery. If the separation between the plates is doubled, then the electric field at a point in the space between the plates

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answer is 2.

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Detailed Solution

initial capacitance  C=ε0AdInitial charge,  Q=CV, E=σε0=Qε0A=CVε0AFinally, C'=ε0A2d=C2,  Q'=C'V=CV2,  E'=σ'ε0=Q'Aε0=CV2ε0A=E2
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