Q.

A highly conducting sheet of aluminium foil of negligible thickness is placed between the plates of a parallel plate capacitor. The foil is parallel to the plates. If the capacitance before the insertion of foil was 10 µF, its value after the insertion of foil will be

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a

20 µF

b

10 µF

c

5 µF

d

zero

answer is B.

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Detailed Solution

C=ε0Ad-t  t is the thickness of the metal plate as it is negligible C remains  constant.
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A highly conducting sheet of aluminium foil of negligible thickness is placed between the plates of a parallel plate capacitor. The foil is parallel to the plates. If the capacitance before the insertion of foil was 10 µF, its value after the insertion of foil will be