Changing magnetic fields can set up current loops in nearby metal bodies and the currents are called as
Options
(a) eddy currents (b) flux currents (c) alternating currents (d) leaking currents
Correct Answer: […]
The phase difference between the flux linked with a coil rotating in a uniform magnetic field and induced emf produced in it is
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(a) π/2 (b) π/3 (c) (-π/6) (d) π
Correct Answer: […]
The self-inductance of a coil having 500 turns is 50mH. The magnetic flux through the cross-sectional area of the coil while current through it is 8 mA is found to be
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(a) […]
For high frequency a capacity offers
Options
(a) Less reactance (b) More reactance (c) Zero reactance (d) Infinite reactance
Correct Answer:
Less reactance
Explanation:
No explanation available. Be the first to write the […]
A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4×10⁻³ Wb. The self-inductance of the solenoid […]
In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes from 2 A to 4 A. The value of coefficient of self induction of the coil is
A straight conductor of length 0.4 m is moved with a speed of 7 ms⁻¹perpendicular to a magnetic field of intensity 0.9 Wbm⁻². The induced emf across the conductor is
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(a) 5.04 […]
A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 T. The velocity of the conductor is 15 ms⁻¹ and is directed perpendicular to the field. The emf indued between the two […]
A rectangular copper coil is placed in a uniform magnetic field of induction 40 mT with its plane perpendicular to the field. The area of the coil is shrinking at a constant rate of 0.5 […]
A metal conductor of length 1m rotates vertically about one of its ends at angular velocity 5 radian per second. If the horizontal component of earth’s magnetic field is 0.2×10⁻⁴ T, then the e.m.f. developed […]
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