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Electromagnetic Field Theory

Electromagnetic Field Theory
Which of the following is zero in relation to electromagnetic fields?

 Curl curl A.
 Grad div A.
 Div grad V.
 Div curl A.

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Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 it is solenoidal.
 it is conservative.
 it has no sink or sources.
 magnetic flux lines are always closed.

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Electromagnetic Field Theory
When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

None of these
The weight of the conductor
The value of current
The direction of the conductor

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Electromagnetic Field Theory
Poyniting vector has the dimensions

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

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Electromagnetic Field Theory
A loop antenna is a commonly used for

All of these
Radar
Satellite communication
Direction finding

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Electromagnetic Field Theory
The hysteresis loop of a magnetic material has an area of 5 cm2 with the scale given as 1 cm = 2 AT and 1 cm = 50 mwb At 50 Hz; the total hysteresis loss is

  25 W.
 50 W.
 15 W.
 20 W.

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