A) \[R/\omega L\]
B) \[R/{{({{R}^{2}}+{{\omega }^{2}}{{L}^{2}})}^{1/2}}\]
C) \[\omega L/R\]
D) \[R/{{({{R}^{2}}-{{\omega }^{2}}{{L}^{2}})}^{1/2}}\]
Correct Answer: B
Solution :
\[\cos \varphi =\frac{R}{Z}=\frac{R}{{{({{R}^{2}}+\omega {{L}^{2}})}^{1/2}}}\]
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