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Electromagnetic Field Theory

Electromagnetic Field Theory
If a and b are the dimensions of waveguide then

a = b/4
a = 2b
a = b
a = 3b

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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 uy N.
 5 × 10-5 ux N.

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Electromagnetic Field Theory
Plane z = 10 m carries charge 20 C/m2. The electric field intensity at the origin is

  – 360 πuz v/m.
 – 18 πuz v/m.
 – 10 uz v/m.
 – 72 πuz v/m.

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

False
True

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Electromagnetic Field Theory
A vector field A = p In is given in Cartesian coordinates. In cylindrical coordinates it will be represented as

 A = cosφ Ir + sinφ Iφ.
 A = sinφ Ir.
 A = cosφ Ir.
 A = cosφ Ir - sinφ Ir.

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

 depends on magnitude of voltage.
 depends on polarity.
 short circuit.
 open circuit.

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