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Electromagnetic Field Theory

Electromagnetic Field Theory
The power gain of a half-wave dipole with respect to an isotropic radiator is

2.15 db
3 db
6 db
4.15 db

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Electromagnetic Field Theory
In free space E (z, t) = 103 sin(ωt - βz) uy v/m. What is the value of H (z, t)

 (103/377) sin(ωt - β z)(ux) A/m.
 None of above.
 (103/377) cos(ωt - β z)(-ux) A/m.
 (103/377) sin(ωt - β z)(-ux) A/m.

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Electromagnetic Field Theory
Which of the following impedance inversion is obtained?

Balun transformer
A quarter wave line
Short-circuited stub
A half wave line

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Electromagnetic Field Theory
Unit of electric flux density is

 coulomb / meter2.
 coulomb.
 weber / meter2.
 farad / meter.

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Electromagnetic Field Theory
A wire 1 m long carries a current of 5A and is at an angle of 30o with B = 1.5 wb/m2. Magnitude of force is

 2.5 N.
 2 N.
 3.75 N.
 5 N.

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Electromagnetic Field Theory
The shape of B-H curve for air gap is

 straight line.
 parabola.
 hyperbola.
 ellipse.

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MORE MCQ ON Electromagnetic Field Theory

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