A) \[\phi ={{\tan }^{-1}}\left( \frac{1}{\omega CR} \right)\]
B) \[\phi ={{\tan }^{-1}}\left( \frac{\omega }{RC} \right)\]
C) \[\phi ={{\tan }^{-1}}\left( \frac{RC}{\omega } \right)\]
D) \[\phi ={{\tan }^{-1}}\sqrt{\frac{\omega }{RC}}\]
Correct Answer: A
Solution :
\[\phi ={{\tan }^{-1}}\left( \frac{{{X}_{C}}}{R} \right)\] \[={{\tan }^{-1}}\left( \frac{1}{\omega RC} \right)\] \[\left( \because {{X}_{C}}=\frac{1}{\omega C} \right)\]
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