Alternating CurrentHard
Question
A series LCR circuit containing a resistance of 120 ohm has angular resonance frequency 4 × 103 rad s-1. At resonance, the voltage across resistance and inductance are 60V and 40 V respectively. The values of L and C are respectively :
Options
A.20 mH, 25/8 μF
B.2 mH, 1/35 μF
C.20 mH, 1/40 μF
D.2 mH, 25/8 μF
Solution
Irms = 
= Amp.
VL = Irms × (ωL)
40 =
× (40 × 103) × L
L = 20 mH
At resonance VC = Irms
= VL
C =
C =
mF.
= Amp.VL = Irms × (ωL)
40 =
× (40 × 103) × LL = 20 mH
At resonance VC = Irms
= VLC =
C =
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