Question

The capacitance of a parallel plate capacitor is 10 uF when distance between its plates is 8 cm. If distance between the plates is reduced to 4 cm, its capacitance will be- (1) 5 uF (2) 10 uF (3) 20 uF (4) 40 uF​

Answer 1

The capacitance of parallel plate capacitor is C=Aϵ0/d​​. where A= area of plate.

Thus, C∝1​/d

If d is halved then the capacitance will be doubled.

Hence the capacitance becomes C′=2C=2(10)=20μF

option C is correct

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