A) The impedance is maximum
B) The current leads the voltage by \[\pi /2\]
C) The current and voltage are in phase
D) The current is minimum
Correct Answer: C
Solution :
: In an LCR circuit, the phase difference \[(\phi )\] between current and voltage is \[\tan \phi =\frac{{{X}_{C}}-{{X}_{L}}}{R}\] At resonance, \[{{X}_{C}}-{{X}_{L}}\] \[\therefore \] \[\tan \phi =0\] or \[\phi ={{\tan }^{-1}}(0)={{0}^{o}}\] Thus the current and voltage are in phase. The current is maximum and the impedance is minimum at resonance in an LCR circuit.
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