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Q.

A parallel plate capacitor of capacitance 90 pF is connected to a battery of emf 20 V. if a dielectric material of dielectric constant K = 5 / 3 is inserted between the plates, the magnitude of the induced charge will be ______ 

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a

2.4 nC

b

1.2 nC

c

0.9 nC

d

0.3 nC

answer is B.

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Detailed Solution

Question Image

The charge in capacitor after placing the dielectric
Q1=C1V
The induced charge on dielectric surface
Qinduced =Q111KQinduced =3115/3=3×25=65=1.2nC

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