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Electromagnetic Field Theory

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

High standing wave ratio
Low directional coupling
Poor directivity
Narrow bandwidth

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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.

 9.04 A.
 4.56 A.
 18.08 A.
 2.28 A.

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Electromagnetic Field Theory
The magnetic field required to reduce the residual magnetism to zero is called

 Coercivity.
 Retentivity.
 Hysteresis.
 Saturation magnetism.

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Electromagnetic Field Theory
Midway between two equal and similar charges, a third equal and similar charge is placed, then this third charge will

 will move out of the field of influence of two charges.
 not be equilibrium.
 be in unstable equilibrium.
 remain in stable equilibrium.

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Electromagnetic Field Theory
RF inductor are characterized by

 high current rating and low resistance.
 high current rating and high resistance.
 low current rating and high resistance.
 low current rating and low resistance.

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Electromagnetic Field Theory
1 Tesla =

 1 wb/m.
 1 wb- m2.
 1 wb/ m2.
 1 wb .

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MORE MCQ ON Electromagnetic Field Theory

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