First slide

AC Circuits

Question

A coil of 200 $Ω$ resistance and 1.0 H inductance is connected to an ac source of frequency $200 / 2 π Hz .$ Phase angle between potential and current will be

Moderate

A

$30 °$
B

$90 °$
C

$45 °$
D

$0 °$

Solution

$tanφ = \frac{X_{L}}{R} = \frac{2 πνL}{R} = \frac{2 π \times \frac{200}{2 π} \times 1}{200} = 1 \Rightarrow φ = 45^{o}$

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