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Electromagnetic induction

Electromagnetic induction
Which of the following is unit of inductance?

Hennry
Ohm
Ampere turns
Weber/metre

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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

30 mH
36 mH
48 mH
38 mH

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Electromagnetic induction
A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be

12 mH
48 mH
24 mH
6 mH

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Electromagnetic induction
Increasing the field or increasing the current will decrease the force on the conductor.

No
Yes

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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

2.0
0.5
1.0
2.5

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Electromagnetic induction
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it

Moves parallel to the direction of the magnetic field
Lies in a magnetic field
Cuts magnetic flux
Lies perpendicular to the magnetic flux

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