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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

6 db
2.15 db
3 db
4.15 db

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Electromagnetic Field Theory
A magnetic field B = 5 × 10-2 uz T exerts a force on 0.02 m conductor along the x-axis. The conductor carried a current of 5 mA in the – ux direction. What force must be applied to the conductor to hold it in position

 5 × 10-5 ux N.
 5 × 10-5 uy N.
 5 × 10-5 uz N.
  - 5 × 10-5 uy N.

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Electromagnetic Field Theory
In above question no. 9, the average force on the core to reduce the air gap will be

 832.29 N.
 1666.22 N.
 6664.8 N.
 3332.47 N.

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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.

 145.
 150.
 225.
 250.

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Electromagnetic Field Theory
The right hand rule for determining the direction of the induced EMF was introduced by

 Faraday
 Lenz
 Maxwell
 Fleming

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Electromagnetic Field Theory
Plane z = 10 m carries charge 20 C/m2. The electric field intensity at the origin is

 – 18 πuz v/m.
 – 72 πuz v/m.
 – 10 uz v/m.
  – 360 πuz v/m.

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