A rod of 10 cm length is moving perpendicular to uniform magntic field of intensity 5×10⁻⁴Wbm⁻². If the acceleration of the rod is 5ms⁻¹, then the rate of increase of induced emf is
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A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω are connected in series to an a.c. voltage source. The current in the circuit is
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(a) 10√2 A […]
A conductor of length 5 cm is moved parallel to itself with a speed of 2 m/s, perpendicular to a uniform magnetic field of 10⁻³ Wb/m². The induced emf generated is
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(a) […]
A coil has an area of 0.05 m² and it has 800 turns. It is placed perpendicularly in a magnetic field of strength 4×10⁻⁵ Wb/m². It is rotated through 90⁰ in 0.1 sec. The avarage […]
A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions per second, in a uniform magnetic field of 0.1 tesla with its plane perpendicular to the field. The e.m.f. induced […]
The inductive reactance of an inductor of 1/π henry at 50 Hz frequency is
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(a) 5πΩ (b) 50Ω (c) 50πΩ (d) 100Ω
Correct Answer:
100Ω
Explanation:
No explanation available. Be the first […]
The current in the coil of inductance 5H decreases at the rate of 2 A/s. The induced e.m.f is
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(a) 2 V (b) 5 V (c) 10 V (d) -10 V
Correct […]
The flux linked with a coil at any intant t is given by ?=10t² – 50t + 250. The induced emf at t=3 sec is
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(a) 190 V (b) -190 V (c) […]
An air core solenoid has 1000 turns and is one meter long. Its cross sectional area is 10 cm². Its self inductance is
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(a) 0.1256 mH (b) 12.56 mH (c) 1.256 mH […]
Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100 V. The self inductance of the coil is
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(a) 0.25 H (b) 0.4 […]
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