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A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor
(a) decreases
(b) remains unchanged
(c) becomes infinite
(d) increases.

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(b)  Aluminium is a good conductor. Its sheet introduced between the plates of a capacitor is of negligible thickness. The capacity remains unchanged.

With air as  dielectric, C = (ε0A)/d

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