A) \[{{90}^{o}}\]
B) \[{{180}^{o}}\]
C) \[{{0}^{o}}\]
D) \[{{60}^{o}}\]
Correct Answer: C
Solution :
In an L-C-R circuit phase angle is defined as \[\cos \phi =\frac{R}{Z}\] where \[Z=\sqrt{{{R}^{2}}+{{({{X}_{L}}-{{X}_{C}})}^{2}}}\] When circuit is resonant \[{{X}_{L}}={{X}_{C}}\] \[\therefore \] \[Z=R\] So, \[\cos \phi =\frac{R}{R}=1\] or \[\phi ={{0}^{o}}\]
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