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Electromagnetic induction

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

Zero inductance
Unchanged inductance
Increased inductance
Reduced inductance

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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
48 mH
12 mH
24 mH

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Electromagnetic induction
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns.

Yes
No

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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

24 mH
3 mH
28 mH
12 mH

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Electromagnetic induction
Mutually inductance between two magnetically coupled coils depends on

All of the listed here
The number of their turns
Permeability of the core
Cross-sectional area of their common core

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Electromagnetic induction
In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be

2.5
1.0
0.5
2.0

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MORE MCQ ON Electromagnetic induction

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