Electromagnetic...

Plane electromagnetic waves are

The waves used in telecommunication are:

Physical properties shared by both radio waves and sound waves are that

1. both can be polarised
2. both can be reflected
3. both can be diffracted

Choose the correct option.

When a plane electromagnetic wave travels in vacuum, the average electric energy density is given by (here E₀ is the amplitude of the electric field of the wave)

Which of the following electromagnetic waves have the longest wavelength?

Maxwell’s displacement current is a response to

An electromagnetic wave travels along the z-direction. Which of the following pairs of space and time-varying E and B fields would generate such a wave?

According to Maxwell’s equations

Displacement current was first postulated by

In an electromagnetic wave travelling in air, the respective amplitudes E₀ and B₀ of the electric and magnetic fields are related as (here c is the speed of the wave in air)

Velocity of electromagnetic waves in a medium depends upon

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0  10¹⁰ Hz. What is the wavelength of the wave?

The direction of electromagnetic waves is given by

If u_e and u_m respectively are the electric and magnetic field densities in an electromagnetic (EM) wave and 'C' is the speed of light, then

Which of these mechanisms can be used to produce electromagnetic waves?

The speed of electromagnetic waves in vacuum is given by

An electromagnetic wave is produced by oscillating electric and magnetic fields E and B, respectively. Choose the incorrect statement from the given alternatives.

If c is the speed of electromagnetic waves in vacuum, then their speed in a medium of dielectric constant K and relative permeability μ_r is

Which of the following statements is false? 

Without the concept of displacement current it is not possible to correctly apply Ampere’s law on a path parallel to the plates of parallel plate capacitor C in