A) 0.4
B) 0.6
C) 0.8
D) 1.0
Correct Answer: B
Solution :
\[Z=\sqrt{{{R}^{2}}+{{X}^{2}}}=\sqrt{{{4}^{2}}+{{3}^{2}}}=5\] \[\therefore \,\,\cos \varphi =\frac{R}{Z}=\frac{3}{5}=0.6\]
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