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Question: In a series LCR circuit, resistance \(R = 10\Omega\) and the impedance \(Z = 20\Omega.\) The phase d...

In a series LCR circuit, resistance R=10ΩR = 10\Omega and the impedance Z=20Ω.Z = 20\Omega. The phase difference between the current and the voltage is

A

30o30^{o}

B

45o45^{o}

C

60o60^{o}

D

90o90^{o}

Answer

90o90^{o}

Explanation

Solution

cos⁡φ=RZ=1020=12⇒φ=60o\cos\varphi = \frac{R}{Z} = \frac{10}{20} = \frac{1}{2} \Rightarrow \varphi = 60^{o}