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Electromagnetic Field Theory

Electromagnetic Field Theory
MUF is highest in periods of greatest sunspot activity.

True
False

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Electromagnetic Field Theory
An infinite non conducting sheet of charge has σ of 10-7 c/m3. Equipotential surface for a potential of 10 volts is.

 0.88 mm.
 1.32 mm.
  1.77 mm.
 0.

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

 1.19 m.
 1.29 m.
 1.39 m.
 1.59 m.

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Electromagnetic Field Theory
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as

None of these
Front to back ratio
Transmission efficiency
Loss coefficient

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

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Electromagnetic Field Theory
A conductor of length 1 metre moves at right angles to magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced emf in the conductor will be

 25 V.
 100 V.
 50 V.
 75 V.

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