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Electromagnetic induction

Electromagnetic induction
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is

20 wb
0.2 wb
2 wb
0.02 wb

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Electromagnetic induction
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by

The resistance of magnetic path
Variation in coil current
Change of number of turns of coil
Variation in voltage to the coil

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Electromagnetic induction
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will

12 mH
3 mH
24 mH
28 mH

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Electromagnetic induction
A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

10 V
15 V
25 V
12 V

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Electromagnetic induction
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is

250 mH
3500 mH
None of the listed here
350 mH

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Electromagnetic induction
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be

3 mH
24 mH
12 mH
48 mH

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