List of top Physics Questions on Electromagnetic waves

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) :} The electromagnetic wave exerts pressure on the surface on which they are allowed to fall.
Reason (R) :} There is no mass associated with the electromagnetic waves.
In the light of the above statements, choose the correct answer from the options given below :

A light of energy flux \[ 9\ \text{W cm}^{-2} \] is incident for \(20\) minutes on a black surface of area \[ 100\ \text{cm}^2. \] Then the maximum average force exerted on the surface is \[ (c=3\times10^8\ \text{m s}^{-1}) \]

The magnetic field in a plane electromagnetic wave travelling in glass (\( n = 1.5 \)) is given by \[ B_y = (2 \times 10^{-7} \text{ T}) \sin(\alpha x + 1.5 \times 10^{11} t) \] where \( x \) is in metres and \( t \) is in seconds. The value of \( \alpha \) is:

The wavelength range of the electromagnetic waves suitable for radar systems used in aircraft navigation is

State the important characteristics of electromagnetic waves.

Write down the difference between displacement current and conduction current. The equation of an electromagnetic wave is \(B_y = 2\times10^{-7}\,\sin(500x + 1.5\times10^{11}t)\) Tesla. Find the equation of the electric field of the wave, the direction of propagation and the wavelength of the wave.

What is meant by displacement current? What is the difference between displacement current and conduction current? Write down their formulae.

What are the uses of microwaves?

Explain displacement current and write the formula related to Ampere-Maxwell's law.

Amplitude of intensity of magnetic field of an electromagnetic wave in vacuum is 500 nT. What will be the amplitude of the intensity of electric field of the wave?

The unit of \(\dfrac{1}{\mu_0 \varepsilon_0}\) is:

What are electromagnetic waves? Explain two characteristics of these waves.

What are electromagnetic waves? Draw their propagation diagram. Show the electric field amplitude and magnetic field amplitude in the propagation diagram.

Among the following, the electromagnetic wave of minimum frequency is:

What are electromagnetic waves? An electromagnetic wave is moving in the X direction and the directions of its electric and magnetic fields are Y and Z respectively. Write the general equations for the electric and magnetic fields of the wave. How are electromagnetic waves different from sound waves?

What is displacement current? How is displacement current different from conduction current?

The correct increasing order of wavelength for UV, Visible light, and Microwaves is:

Three charges \(+20\,\mu C\), \(+20\,\mu C\) and \(-20\,\mu C\) are placed at the vertices \(A\), \(B\) and \(C\) respectively of an equilateral triangle of side \(1\,m\). Find the net force acting on the charge at vertex \(A\).

A thin charged spherical shell of radius \(10\,cm\) has a uniform surface charge density of \(20\,pC/cm^{2}\). The electric potential at a point \(8\,cm\) from the centre of the shell is:

Two large, thin, parallel sheets have surface charge densities of opposite signs and equal magnitude \(\sigma\). What is the magnitude of the electric field \((E)\) in the region between the sheets?

A sphere encloses charges \(+5\,C\) and \(-2\,C\), while a charge \(-3\,C\) is outside the sphere. What is the electric flux through the sphere?

A \(1\,\mu F\) capacitor is charged to \(12\,V\) and then connected to an identical uncharged capacitor. What will be the common potential?

An electromagnetic wave has a frequency of 150 MHz. Its wavelength in air is approximately:

The CORRECT statement among the following regarding electromagnetic waves is