ELECTROMAGNETIC FIELD THEORY QUIZ

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.

ω / π.

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A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is

40π coulombs.

80π coulombs.

none of these.

10π coulombs.

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Which of the following statement is correct for divergence of electric and magnetic flux densities?

It is zero for the electric flux density.

These are zero for static densities but non zero for time varying densities.

It is zero for the magnetic flux density.

Both are zero.

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Gradient of scalar field is expressed as

Outward flux of a vector field per unit volume as the volume about the point tends to zero.

Maximum rate of increase of scalar function at a point.

Circulation of a vector field per unit area as the area tends to zero.

Gradient of divergence of a vector field minus the curl of the vector field.

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If an electric current carrying coil is placed in a uniform magnetic field in the direction of magnetic induction, then

the net force is zero but torque is finite.

the net force and torque on the coil are both zero.

the net force and torque are both finite.

the net force is finite but torque is zero.

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YOUR ANSWER : ?

The field at any point on the axis of a current carrying coil will be

at angle of 45° with the axis.

parallel to axis.

perpendicular to the axis.

zero.

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A conductor of length 100 cm moves at right angles to a magnetic field of flux density 1.5 Wb/m2 with a velocity of 50 m/s. The induced emf in the conductor will be

50 V.

150 V.

37.5 V.

75 V.

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The magnitude of force acting on a current carrying conductor placed in a magnetic field is independent of

current flowing through the conductor.

length of conductor.

cross-sectional area of conductor.

flux density.

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In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

An increase in the value of reactance

No change in the reactance value

No change in the impedance value

Decrease in the value of reactance

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When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

Refraction

Transmission

Reflection

None of these

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