A) unity when the circuit contains an ideal inductance only
B) unity when the circuit contains an ideal resistance only
C) zero when the circuit contains an ideal resistance only
D) unity when the circuit contains an ideal capacitance only
Correct Answer: B
Solution :
[b] \[\cos \,\phi =\frac{R}{Z}\], where Z is the impedance & \[Z=\sqrt{{{R}^{2}}+{{({{X}_{L}}-{{X}_{C}})}^{2}}}\], if there is only resistance then \[Z=R\Rightarrow \cos \,\phi =1\]
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