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Electromagnetic Field Theory

Electromagnetic Field Theory
The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

Null
Figure of eight
Circle
None of these

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Electromagnetic Field Theory
For DC voltage an inductor is virtually a

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

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Electromagnetic Field Theory
A potential field is given by V = 3x2 y – yz. The electric field at P(2, -1, 4) is

 12 Ix - Iz V/m.
 12 Ix - 8 Iy - Iz V/m.
 12 Ix - 8 Iy V/m.
 12 Ix + 8 Iy + Iz V/m.

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 2.28 A.
 9.04 A.
 18.08 A.
 4.56 A.

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Electromagnetic Field Theory
The property of the coil by which a counter emf is induced in it when the current through the coil changes is known as

 mutual inductance.
 self inductance.
 capacitance.
 series aiding inductance.

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Electromagnetic Field Theory
In a lossless medium the intrinsic impedance η = 60π and μr = 1. The relative dielectric constant εr shall be

 8.
 4.
 1.
 2.

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