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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is halved

is quadrupled

is doubled

remains unchanged

answer is B.

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Detailed Solution

initial capacitance $C = \frac{ε_{0} A}{d}$

Initial charge, $Q = CV, E = \frac{σ}{ε_{0}} = \frac{Q}{ε_{0} A} = \frac{C V}{ε_{0} A}$

$Finally, C' = \frac{ε_{0} A}{2 d} = \frac{C}{2}, Q' = C' V = \frac{C V}{2}, E' = \frac{σ'}{ε_{0}} = \frac{Q'}{A ε_{0}} = \frac{C V}{2 ε_{0} A} = \frac{E}{2}$

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