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Electromagnetic Field Theory

Electromagnetic Field Theory
A long straight wire carries a current I = 10A. At what distance is the magnetic field H = 1A/m?

 1.39 m.
 1.29 m.
 1.59 m.
 1.19 m.

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Electromagnetic Field Theory
Whenever the magnetic flux changes with respect to an electric conductor or a coil, an EMF is induced in the conductor is Faraday’s

 third law
 fourth law
 first law
 second law

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Electromagnetic Field Theory
A circular loop has its radius increasing at a rate of 2 m/s. The loop placed perpendicular to a constant magnetic field of 0.5 wb/m2. When the radius of the loop is 4 m. the emf induced in the will be

 Zero.
 0.8 π V.
 0.4 π V.
 8 π V.

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Electromagnetic Field Theory
Electric field strength of charge

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

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Electromagnetic Field Theory
Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

 not be equilibrium.
 will move out of the field of influence of two charges.
 be in unstable equilibrium.
 remain in stable equilibrium.

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Electromagnetic Field Theory
In an inductor current cannot change abruptly. Comment on the statement.

 True.
 False.
 Cannot comment.
 True partially.

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