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Electromagnetic induction

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

12 mH
48 mH
3 mH
24 mH

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Electromagnetic induction
Lenz's law is a consequence of the law of conservation of

Induced e.m.f.
Induced current
Energy
Charge

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Electromagnetic induction
In case of an inductance, current is proportional to

Voltage across the inductance
None of the listed here
Both of the listed here
Magnetic field

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Electromagnetic induction
Which of the fpllowing inductor will have the least eddy current losses ?

Powdered iron core
Iron core
Laminated iron core
Air core

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Electromagnetic induction
Mutually inductance between two magnetically coupled coils depends on

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

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Electromagnetic induction
Which circuit element(s) will oppose the change in circuit current?

Inductance and capacitance
Inductance only
Capacitance only
Resistance only

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