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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?

 1.19 m.
 1.29 m.
 1.59 m.
 1.39 m.

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Electromagnetic Field Theory
An electric field on a place described by its potential V = 20 (r -1 + r-2) where r is the distance from the source. The field is due to

 A monopole.
 Both of A and B.
 A dipole.
 A quardra pole.

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Electromagnetic Field Theory
An emf of 16 volts is induced in a coil of inductance 4 H. The rate of change of current must be

 64 A / s.
 32 A / s.
 4 A / s.
 16 A / s.

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

 20 W.
 50 W.
 15 W.
  25 W.

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Electromagnetic Field Theory
Radiation intensity in a given direction is the

Power radiated per unit solid angle in that direction
None of these
Power radiated per square metre
Energy radiated per square metre

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Electromagnetic Field Theory
It is best to use for coupling a coaxial line to a parallel wire transmission line.

Directional Coupler
Tee
Balun
Slotted line

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