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Electromagnetic Field Theory

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

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

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Electromagnetic Field Theory
In order to minimize loss due to hysteresis the magnetic material should have

 small B-H loop area.
 high resistivity.
 large coercivity.
 high hysteresis coefficient.

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Electromagnetic Field Theory
The critical frequency of ‘F’ layer is greater than 30 MHz.

True
False

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

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Electromagnetic Field Theory
Poyniting vector has the dimensions

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

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Electromagnetic Field Theory
The magnitude of force acting on a current carrying conductor placed in a magnetic field is independent of

 cross-sectional area of conductor.
 current flowing through the conductor.
 length of conductor.
 flux density.

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