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Electromagnetic induction

Electromagnetic induction
The law that the induced e.m.f. and current always oppose the cause producing them is due to

Faraday
Newton
Lenz
Coulomb

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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

48 mH
38 mH
30 mH
36 mH

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Electromagnetic induction
A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be

25 V
10 V
12 V
15 V

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Electromagnetic induction
A moving magnetic field will produce the same effect as a conductor that is moving.

False
True

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

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

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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

48 mH
12 mH
24 mH
3 mH

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