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Electromagnetic-theory Questions Set 69:

Quiz Mode

Which of the following equations describes a circular polarization?

Ey = mEx

Ex² + Ey² = Eₒ²

Ex²/E₁² + Ey²/E₂² = 1

Ex² / Ey² = 1

Solution:

The work done in carrying a charge through an equipotential surface is:

zero

depends on the charge Q

is infinity

depends on the distance

Solution:

If the distance is doubled, what happens to the electric field intensity?

Reduces to half

Reduces by 2 times

Reduces by 4 times

Increases by 4 times

Solution:

Three capacitors of 2.0 μF, 3.0 μF, and 6.0 μF are connected in series to a 10 V source. What is the charge on the 3.0 μF capacitor?

5 μC

10 μC

12 μC

15 μC

Solution:

The purpose of the retardation test on D.C. shunt machines is to find out

(a) stray losses

(b) eddy current losses

(d) windage losses

Solution:

A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment and the pole strength of either part is

M/2, m/2

M, m/2

M/2, m

M, m

Solution:

The ratio of masses of three wires is 1:2:3 and that of their lengths is 3:2:1. If the wires are made of the same material, the ratio of their resistances will be:

1:1:1

1:2:3

9:4:1

27:6:1

Solution:

The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

Perpendicular

Parallel

Inclined at 60°

Inclined at 30°

Solution:

In an AC circuit, the current lags behind the voltage by a phase difference of 90°. Which of the following components is present in the circuit?

Only a resistor (R)

Only an inductor (L)

Only a capacitor (C)

A resistor (R) and a capacitor (C)

Solution:

An electromagnetic wave in a vacuum has the electric and magnetic fields E and B, which are always perpendicular to each other. The direction of polarization is given by X and the direction of wave propagation by k. Then:

X || B and k || B×E

X || E and k || E×B

X || B and k || E×B

X || E and k || B×E

Electromagnetic-theory Questions Set 69:

Which of the following equations describes a circular polarization?

Solution:

The work done in carrying a charge through an equipotential surface is:

Solution:

If the distance is doubled, what happens to the electric field intensity?

Solution:

Three capacitors of 2.0 μF, 3.0 μF, and 6.0 μF are connected in series to a 10 V source. What is the charge on the 3.0 μF capacitor?

Solution:

The purpose of the retardation test on D.C. shunt machines is to find out

Solution:

A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment and the pole strength of either part is

Solution:

The ratio of masses of three wires is 1:2:3 and that of their lengths is 3:2:1. If the wires are made of the same material, the ratio of their resistances will be:

Solution:

The effect of stray magnetic field on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are

Solution:

In an AC circuit, the current lags behind the voltage by a phase difference of 90°. Which of the following components is present in the circuit?

Solution:

An electromagnetic wave in a vacuum has the electric and magnetic fields E and B, which are always perpendicular to each other. The direction of polarization is given by X and the direction of wave propagation by k. Then:

Solution:

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