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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: - Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- The input characteristics of a transistor in CE mode is the graph obtained by plotting
- A coin of mass m and radius r having moment of inertia I about the axis passes
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- The input characteristics of a transistor in CE mode is the graph obtained by plotting
- A coin of mass m and radius r having moment of inertia I about the axis passes
- A thin rod of length L and mass M is bent at its midpoint into two halves
- The work done in which of the following processes is zero?
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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