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Electromagnetic induction

Electromagnetic induction
A crack in the magnetic path of an inductor will result in

Unchanged inductance
Increased inductance
Reduced inductance
Zero inductance

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Electromagnetic induction
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

Decreases
None of the listed here
Increases
Remains same

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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

15 V
12 V
10 V
25 V

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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

24 mH
48 mH
12 mH
3 mH

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Electromagnetic induction
Two 300 uH coils in series without mutual coupling have a total inductance of

900 uH
1200 uH
300 uH
600 uH

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Electromagnetic induction
The direction of induced e.m.f. can be found by

Laplace's law
Kirchhoff s voltage law
Lenz's law
Fleming's right hand rule

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MORE MCQ ON Electromagnetic induction

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