A) 0.64
B) 0.80
C) 0.33
D) 0.56
Correct Answer: B
Solution :
[b] Power factor, \[\phi =\frac{R}{\sqrt{{{\left( \omega L-\frac{1}{\omega C} \right)}^{2}}+{{R}^{2}}}}\] \[=\frac{8}{\sqrt{{{(31-25)}^{2}}+{{8}^{2}}}}=\frac{8}{\sqrt{{{6}^{2}}+{{8}^{2}}}}=\frac{8}{10}=0.8\]
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