Question

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

• A. ${60}^0$
• B. ${30}^0$
• C. ${45}^0$
• D. ${90}^0$

Answer 1

The correct option is A ${60}^0$

From the figure we can see

$cos\theta =\frac{10}{20}=\frac{1}{2}$

$\theta ={60}^0$