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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
A magnetic material has a total flux B of 80 micro Wb with an mmf of 160 AT. The reluctance in ampere turn per weber is

 2 × 10-6.
 2 × 10-8.
 2 × 106.
 2 × 108.

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Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Antenna height
Wave frequency
Distance of the point from the antenna
Current of the antenna

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Electromagnetic Field Theory
The force required to seperate two surfaces with a contact area measuring 5 cm by 6 cm, when flux density normal to the surface is 0.8 tesla, will be

 764 N.
 7640 N.
 76400 N.
 76.4 N.

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Electromagnetic Field Theory
The potential that appears at a point in space due to the current which caused it is called potential

Accelerating
Retardation
Lagging the current
Oscillating

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Electromagnetic Field Theory
Poyniting vector has the dimensions

 Watt × metre2.
 Watt × metre.
 Watts/metre2.
 Watt/metre.

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MORE MCQ ON Electromagnetic Field Theory

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