Electro Magnetic Induction And Alternating Currents Question 43

Question: A 12 ohm resistor and a 0.21 henry inductor are connected in series to an ac source operating at 20 volts, 50 cycle/second. The phase angle between the current and the source voltage is [BHU 1994]

Options:

A) 30°

B) 40°

C) 80°

D) 90°

Show Answer

Answer:

Correct Answer: C

Solution:

$ \tan \varphi =\frac{\omega L}{R}=\frac{2\pi \times 50\times 0.21}{12}=5.5,\Rightarrow ,\varphi =80^{o} $



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