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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: - Eight drops of a liquid of density ρ and each of radius a are falling through air
- Which one of the following statements is true, if half-life of a radioactive substance
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Eight drops of a liquid of density ρ and each of radius a are falling through air
- Which one of the following statements is true, if half-life of a radioactive substance
- Two concentric coils each of radius equal to 2π cm are placed at right angles
- Magnetic induction produced at the centre of a circular loop carrying current is B.
- The ratio of minimum wavelengths of Lyman and Balmer series will be
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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