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Electromagnetic induction

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

Laminated iron core
Air core
Iron core
Powdered iron core

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

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

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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
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be

Halved
Unaffected
Quadrupled
Doubled

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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
Cross-sectional area of their common core
Permeability of the core

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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
30 mH
36 mH
48 mH

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