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Electromagnetic Field Theory

Electromagnetic Field Theory
The frequency of the power wave associated with an electromagnetic wave having field as E = e-z/δ cos(ω - zδ) is given by

 ω / π.
 ω/2π.
 ω/4π.
 ω.

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Electromagnetic Field Theory
Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

 450.
 150.
 300.
 600.

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Electromagnetic Field Theory
The frequency range for satellite communication is

3 to 30 kHz
3000 to 30000 MHz
300 to 3000 kHz
30000 to 300000 MHz

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = cosφ Ir + sinφ Iφ.
 A = sinφ Ir.
 A = cosφ Ir.
 A = cosφ Ir - sinφ Ir.

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

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Electromagnetic Field Theory
As a result of reflection from a plane conducting wall, electromagnetic waves acquire an apparent velocity greater than the velocity of light in space. This is called the

 normal velocity.
 group velocity.
 velocity of propagation.
 phase velocity.

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MORE MCQ ON Electromagnetic Field Theory

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