List of top Physics Questions on Electromagnetic Waves

The velocity of an electromagnetic wave in a medium with \(\varepsilon_r=2\) and \(\mu_r=18\) is

The oscillating electric and magnetic field vectors of an electromagnetic wave are in

The source of electromagnetic waves can be

Arrange the following media (characterised by their relative dielectric permittivities \((\varepsilon_r)\) and relative magnetic permeabilities \((\mu_r)\)) according to the velocity of an electromagnetic wave propagating in them in ascending order. (A) \(\varepsilon_r=4,\ \mu_r=400\) (B) \(\varepsilon_r=3,\ \mu_r=300\) (C) \(\varepsilon_r=4,\ \mu_r=250\) (D) \(\varepsilon_r=5,\ \mu_r=150\) Choose the correct answer from the options given below:

A magnetic field vector in an electromagnetic wave is represented by \[ \vec{B} = B_0 \sin\left(2\pi \nu t - \frac{2\pi x}{\lambda}\right)\hat{j} \] Its associated electric field vector is ________.

An electromagnetic wave travels in free space along the \(x\)-direction. At a particular point in space and time, \[ \vec{B} = 2 \times 10^{-7}\,\hat{j}\,\text{T} \] is associated with this wave. The value of corresponding electric field \(\vec{E}\) at this point is __________ V/m.

Electromagnetic waves are:

The ratio of electric field amplitudes and magnetic field amplitudes in an electromagnetic wave in vacuum is equal to:

Two long parallel wires carrying currents in the same direction will:

Which segment of the electromagnetic wave spectrum is primarily used in line-of-sight radar systems for aircraft navigation and to cook food inside kitchen appliances?

Two long, straight parallel wires separated by a distance \( r \) carry steady currents \( I_1 \) and \( I_2 \) in the exact same direction. What type of magnetic force interaction do they experience?

The electric and magnetic field vectors of a plane electromagnetic wave propagating along the positive x-axis are represented by \( \vec{E} \) and \( \vec{B} \) respectively. Which of the following vector expressions correctly defines the direction of propagation of this wave?

Which of the following choices correctly sequences the designated segments of the electromagnetic wave spectrum in an increasing order of their respective photon energies?

The electric field in a plane electromagnetic wave is given by \(E_z = 60 \cos(5x + 1.5 \times 10^{10} t)\) V/m. Then expression for the corresponding magnetic field (\(B_y\)) is (here subscripts denote the direction of the field) is:

Estimate the ratio of shortest wavelength of radio waves to the longest wavelength of gamma waves.

An electromagnetic wave is travelling in vertically upward direction. At an instant, its electric field vector points in west direction. In which direction does the magnetic field vector point at that instant?

How is an electromagnetic wave produced?

Write the drawbacks of Rutherford’s atomic model. How did Bohr remove them? Show that different orbits in Bohr’s atom are not equally spaced.

(a) On what factors does the speed of an electromagnetic wave in a medium depend?
(b) How is an electromagnetic wave produced?
(c) Sketch a schematic diagram depicting the electric and magnetic fields for an electromagnetic wave propagating along the z-axis.