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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 curl A.
 Div grad V.

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Electromagnetic Field Theory
The main disadvantage of the two-hole directional coupler is

High standing wave ratio
Narrow bandwidth
Poor directivity
Low directional coupling

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Electromagnetic Field Theory
Self inductance of magnetic coil is proportional to

 N2.
 1 / N2.
 1 / N.
 N.

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

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Electromagnetic Field Theory
________ at a point is defined as the force experienced per unit positive charge at a point placed in the electric field.

 Electric intensity.
 Magnetic flux density.
 Electric flux.
None of these

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Electromagnetic Field Theory
The energy stored in the magnetic field at a solenoid 30 cm long and 3 cm diameter wound with 1000 turns of wire carrying an current at 10 A, is

 1.15 J.
 0.5 J.
 0.015 J.
 0.15 J.

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