Question

In a series LCR circuit $R=10\Omega$ and impedance $Z=20\Omega$. Then the phase difference between the current and the voltage is

• A. 30${}^{\circ }$
• B. 45${}^{\circ }$
• C. 9${}^{\circ }$
• D. 60${}^{\circ }$

Answer 1

Answer: (D)

cos $\varphi =\frac{R}{Z}=\frac{10}{20}=\frac{1}{2}i.e.\varphi =60^{\circ }$