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Physics
An LCR series circuit is at resonance. Then
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Q. An $LCR$ series circuit is at resonance. Then
KEAM
KEAM 2010
Alternating Current
A
the phase difference between current and voltage is $ {{90}^{o}} $
15%
B
the phase difference between current and voltage is $ {{45}^{o}} $
12%
C
its impedance is purely resistive
47%
D
its impedance is zero
18%
E
the current is minimum
18%
Solution:
An L-C-R series circuit is at resonance. Then its impedance $ znin=R $ .