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Electromagnetic Field Theory

Electromagnetic Field Theory
For an inductor, current is proportional to

 voltage across the inductor.
 both (A) and (B).
 magnetic field.
 none of them.

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Electromagnetic Field Theory
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.

 150.
 145.
 250.
 225.

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Electromagnetic Field Theory
Electric field strength of charge

 Decrease with distance.
 Decrease with square distance.
 Increase square distance.
 Increase distance.

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Electromagnetic Field Theory
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the inductor has ferrite core.
 the inductor is made of thin wire.
 the inductor is non linear.
 the above statement is false.

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Electromagnetic Field Theory
Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

 5T.
 2.5T.
 0.5T.
 10T.

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.447.
 0.477.
 0.01.
 0.577.

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