Current Electricity Test

Result

Current Electricity Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Electromagnetic waves are produced by;

A
static charge

B
moving charge

C
an accelerated charge

D
charge particle

Solution

An accelerating charged particle produces an electromagnetic (EM) wave. Electromagnetic waves are electric and magnetic fields traveling through empty space with the speed of light c. A charged particle oscillating about an equilibrium position is an accelerating charged particle. If its frequency of oscillation is f, then it produces an electromagnetic wave with frequency f. The wavelength λ of this wave is given by λ = c/f. Electromagnetic waves transport energy through space. This energy can be delivered to charged particles a large distance away from the source.
Question 2
1 / -0

The idea of displacement current was introduced by,

A
Maxwell

B
Hertz

C
Marconi

D
Bose

Solution

The idea of displacement current was introduced by Maxwell.
Question 3
1 / -0

The direction of propagation of electromagnetic wave is same as that of (Here electric field is E magnetic field B)

A
E × B

B
B × E

C
E

D
B

Solution

The direction of propagation of an electromagnetic wave is given by the vector product of electric field vector and the magnetic field vector.

Mathematically given as,

E X B
Question 4
1 / -0

Which of the following waves have the maximum wavelength?

A
Infrared rays

B
UV rays

C
Radio waves

D
X-rays

Solution

Radio waves are low frequency electromagnetic waves. So their wavelengths will be comparatively large.
Question 5
1 / -0

In electromagnetic waves the phase difference between the electric field and the magnetic field is

A
π/4

B
zero

C
π/6

D
π

Solution

Phase difference refers to time difference. Since there is no time difference between the peaks of the electric and magnetic oscillations the phase difference between the electric and magnetic field vectors of a linearly polarized electromagnetic wave is zero.