A given LCR series circuit satisfies the condition for resonance with a given AC source. If the angular frequency of the AC source is increased by 100% then in order to establish resonance, without changing the value of inductance, the capacitance must be
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a
increased by 100%
b
Reduced by 50%
c
increased by 75%
d
reduced by 75%
answer is D.
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Detailed Solution
ωL=1ωc(for resonance)ω2=1LC. . . (i)for case (ii) (2ω)2=1LC1 . . (ii)(ii) divide (i) ⇒4 = =CC1⇒C1=C4The capacitance is to be reduced by 75%.
A given LCR series circuit satisfies the condition for resonance with a given AC source. If the angular frequency of the AC source is increased by 100% then in order to establish resonance, without changing the value of inductance, the capacitance must be