ELECTROMAGNETIC FIELD THEORY QUIZ

Magnetic circuit with cross sectional area of 20 cm2 is to be operated at 50 Hz from 120 Vrms supply. The number of turns required to active a peak magnetic flux density of 1.8 T in the core flux is

300.

450.

600.

150.

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It is best to use for coupling a coaxial line to a parallel wire transmission line.

Directional Coupler

Slotted line

Tee

Balun

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Unit of electric flux density is

coulomb.

coulomb / meter2.

farad / meter.

weber / meter2.

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Which of following circuit element stores energy in electro-magnetic field?

Capacitor.

Condenser.

Inductor.

Variable Resistor.

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Radiation intensity in a given direction is the

None of these

Energy radiated per square metre

Power radiated per unit solid angle in that direction

Power radiated per square metre

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Magnetic flux density emerging out of a closed surface is

depends on magnetic movements outside the closed surface

zero.

depends on magnetic movements inside the closed surface.

infinite.

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An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 O. The standing wave ratio will be

1.5

2.5

4.5

3.5

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A point charge in space is attracted towards a dielectric material because of the

maximisation of electrostatic flux.

phenomenon of dielectric polarisation.

all of above.

dielectric hysteresis.

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Biot-Savarts law states the relation between magnetic intensity and

volume current only.

surface current only.

filament current only.

(A), (B), and (D) are all correct.

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Find the strength of the magnetic field when a 2m long conductor is moving with a velocity 4m/s inducing an emf of 20V.

2.5T.

0.5T.

5T.

10T.

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