If \(\overrightarrow{E}\) and \(\overrightarrow{B}\) represent electric and magnetic field vectors of the electromagnetic waves, then the direction of propagation of the waves will be along

\(\overrightarrow{B}\) × \(\overrightarrow{E}\)
\(\overrightarrow{E}\)
\(\overrightarrow{B}\)
\(\overrightarrow{E}\) × \(\overrightarrow{B}\)

Solution

A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then average pressure exerted on the surface is (c = speed of light)

zero
E/Atc
2E/Atc
E/c

Solution

An electromagnetic wave passes through space and its equation is given by E= E₀ sin (ωt – kx) where E is electric field. Energy density of electromagnetic wave in space is

\(\frac{1}{2}\varepsilon _{0}E_{0}^{2}\)
\(\frac{1}{4}\varepsilon _{0}E_{0}^{2}\)
\(\varepsilon _{0}E_{0}^{2}\)
\(2\varepsilon _{0}E_{0}^{2}\)

Solution

An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ∈ = 4.0 Then

wavelength is halved and frequency remains unchanged
wavelength is doubled and frequency becomes half
wavelength is doubled and the frequency remains unchanged
wavelength and frequency both remain unchanged

Solution

Light wave is travelling along y-direction. If the corresponding \(\overrightarrow{E}\) vector at anytime is along the x-axis, the direction of \(\overrightarrow{B}\) vector at that time is along

y-axis
x-axis
+ z-axis
– z-axis

Solution

Light wave is an electromagnetic wave in which \(\overrightarrow{E}\) and \(\overrightarrow{B}\) are at right angles to each other as well as at right angles to the direction of wave propagation.

A new system of unit is evolved in which the values of µ₀ and ε₀ are 2 and 8 respectively. Then the speed of light in this system will be

0.25
0.5
0.75
1

Solution

For sky wave propagation of a 10 MHz signal, what should be the maximum electron density in ionosphere?

~1.2 × 10¹²m^–3
~10⁶m^–3
~10¹⁴ m^–3
~10²²m^–3

Solution

Which of the following has/have zero average value in a plane electromagnetic wave ?

Both magnetic and electric field
Electric field only
Magnetic energy
Electric energy

Solution

Both magnetic and electric fields have zero average value in a plane e.m. wave.

A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3V m^–1. The magnetic induction (B) along z-axis is

3.1 × 10^–8 T
3 × 10^–5 T
3 × 10^–6 T
9.3 × 10^–6 T

Solution

An electromagnetic wave going through vacuum is described by E = E₀ sin(kx – ωt); B = B₀ sin (kx – ωt). Which of the following equations is true?

E₀k=B₀ω
E₀ω=B₀k
E₀B₀ = ωk
None of these

Solution

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