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Electromagnetic Field Theory

Electromagnetic Field Theory
A dipole having a moment p – 3ux - 5uy + 10uz ncm is located at p(1,2,-4) in free space. The V as Q(2,3,4) is

 1.31 V.
 1.26 V.
 2.52 V.
 2.62 V.

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Electromagnetic Field Theory
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

None of these
Transmission
Refraction
Reflection

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Electromagnetic Field Theory
A waveguide operated below cut off frequency can be used as

An isolator
An attenuator
None
Phase shifter

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Coercivity.
 Hysteresis.
 Saturation magnetism.
 Retentivity.

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Electromagnetic Field Theory
The magnitude of the induced emf in a conductor depends upon on the

 rate of change of flux linkage.
 amount of flux cut.
 flux density of the magnetic field.
 amount of flux linkage.

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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

 150.
 300.
 600.
 450.

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