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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/2π.
 ω/4π.
 ω / π.
 ω.

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Electromagnetic Field Theory
If the static magnetic flux density is B, then

  Divergence of B = 0.
 Divergence of B = J.
 Curl of B = J.
 Curl of B = 0.

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Electromagnetic Field Theory
The heating time constant of an electrical machine gives an indication of its

 overload capacity.
 cooling.
 short time rating.
 rating.

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Electromagnetic Field Theory
Magnetic field intensity at centre of circular coil, of diameter 1 m and carrying a current of 2 A is

 2 A/m.
 4 A/m.
 8 A/m.
 1 A/m.

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

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Electromagnetic Field Theory
A pure inductor when connected across 220 V, 50 Hz supply consumes 100 W. From the above statement it can be concluded that

 the inductor is made of thin wire.
 the above statement is false.
 the inductor is non linear.
 the inductor has ferrite core.

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