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A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be
Options
(a) 4.0 A
(b) 8.0 A
(c) 20 / √13 A
(d) 2.0 A
Correct Answer:
4.0 A
Explanation:
If ? = 50 x 2π then ?L = 20Ω
If ?’ = 100 x 2π then ?’L = 40Ω
I = 200 / Z = 200 / √ R² + (?’L)²
= 200 / √ (30)² + (40)²
I = 4 A
Related Questions: - An electric current passes through a long straight wire
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electric current passes through a long straight wire
- Two waves of same amplitude superpose. The resultant intensity is I₁
- A thermocouple of negligible resistance produces an e.m.f. of 40 µV/⁰C in the linear range
- Two particles are oscillating along the same line with the same frequency
- A body revolved around the sun 27 times faster than the earth. What is the ratio
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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