A) \[\frac{1}{\sqrt{3}}\]
B) \[\frac{1}{\sqrt{5}}\]
C) \[\frac{1}{\sqrt{7}}\]
D) \[\frac{1}{\sqrt{11}}\]
Correct Answer: B
Solution :
Power factor \[\cos \text{o}|=\frac{1}{\sqrt{2}}=\frac{R}{\sqrt{{{R}^{2}}+{{\omega }^{2}}{{L}^{2}}}}\] \[=\frac{R}{\sqrt{{{R}^{2}}+4{{R}^{2}}}}=\frac{1}{\sqrt{5}}\]
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