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Electromagnetic induction

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

Iron core
Powdered iron core
Laminated iron core
Air core

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

900 uH
600 uH
1200 uH
300 uH

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

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

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Electromagnetic induction
Which of the following is unit of inductance?

Ohm
Ampere turns
Weber/metre
Hennry

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Electromagnetic induction
The polarity of the induced voltage can be determined by using the left-hand generator rule.

Yes
No

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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
48 mH
36 mH
30 mH

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