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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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Correct Option (b) remains unchanged


Aluminum is a metal so when we insert an aluminium foil equal and opposite charges appear on its two surfaces Since, it is of negligible thickness, it will not affect the capacitance.

Alternate Method

From the formula

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