The power factor of an $R-L$ circuit is $\frac{1}{\sqrt{3}}$. If the inductive reactance is $2 \Omega$,the value of the resistance is:
- A$2 \Omega$
- B$\sqrt{2} \Omega$
- C$0.5 \Omega$
- D$\frac{1}{\sqrt{2}} \Omega$
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