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Electromagnetic induction

Electromagnetic induction
Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be

38 mH
36 mH
30 mH
48 mH

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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

None of the listed here
350 mH
250 mH
3500 mH

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

Powdered iron core
Iron core
Laminated iron core
Air core

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Electromagnetic induction
The coefficient of coupling between two air core coils depends on

None of the listed here
Self-inductance of two coils only
Mutual inductance between two coils only
Mutual inductance and self inductance of two coils

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Electromagnetic induction
Mutually inductance between two magnetically coupled coils depends on

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

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Electromagnetic induction
Which of the following is not a unit of inductance?

Coulomb/volt ampere
Hennry
All of the listed here
Volt second per ampere

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