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ELECTROMAGNETIC FIELD THEORY

Electromagnetic Field Theory
The energy stored in the magnetic field in a solenoid 10 cm long and 4 cm diameter wound with 2000 turns of wire carrying a current at 20 amp, is

 15 joules.
 30 joules.
 24 joules.
 12 joules.

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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.

 225.
 250.
 150.
 145.

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Electromagnetic Field Theory
1 Tesla =

 1 wb/ m2.
 1 wb/m.
 1 wb- m2.
 1 wb .

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Saturation magnetism.
 Retentivity.
 Hysteresis.
 Coercivity.

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Electromagnetic Field Theory
The tubes of force within the magnetic material are known as

 none of them.
 tubes of indication.
 lines of force.
 magnetic flux.

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