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Q.

The resonant frequency of the L-C circuit is f0 before insertion of the dielectric of εr  = 4 . After inserting the dielectric, the resonant frequency will be: 

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a

f04

b

f02

c

4f0

d

2f0

answer is A.

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Detailed Solution

Resonant frequency of LC circuit is f0=12πLC on inserting a dielectric capacitance increases by εr(=4) times, now the new frequency is f=12πL4C=f02

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