Electromagnetic waves practice · Medium

Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space

If electric field $E=E_0 \sin (\omega t-k z) \hat{i}$ and magnetic field $B=B_0 \sin (\omega t-k z) \hat{j},$ then electromagnetic wave travels along

An electromagnetic wave is travelling to the east. At one instant at a given point its E vector points straight up. What is the direction of is B vector ?

A charged particle can continue to move with a constant velocity in a region wherein,

A. $E=0, B \neq 0$

B. $E \neq 0, B=0$

C. $E \neq 0, B \neq 0$

D. $E=0, B=0$

Select correct alternative:

Given below are two statements:

Statement I : Electromagnetic waves are not deflected by electric and magnetic field.

Statement II: The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other as $E_0=\sqrt{\frac{\mu_0}{\varepsilon_0}} B_0$.

In the light of the above statements, choose the correct answer from the options given below :

Suppose that the electric field amplitude of an electromagnetic wave is $E_0=120 \mathrm{~NC}^{-1}$ and that its frequency is $v=50.0 \mathrm{~MHz}$. Determine, $B_0, \omega, k$ and $\lambda$.

A cylindrical region of radius $1.2 \mathrm{~m}$ is containing a uniform electric field that is increasing uniformly with time. At $\mathrm{t}=0$ the field is zero and at $\mathrm{t}=5.0 \mathrm{~s}$ the field is $200 \mathrm{~V} / \mathrm{m}.$ The total displacement current through a cross section of the region is:

Infrared radiation is detected by

If an electromagnetic wave propagating through vacuum is described by $E_y=E_0 \sin (k x-\omega t), B_z=B_0 \sin (k x-\omega t)$, then

A particle of specific charge $\left(\frac{\text { charge }}{\text { mass }}\right) \alpha$ start moving from origin under action of an electric field $\vec{E}=E_0 \hat{i}$ and magnetic field $\vec{B}=B_0 \hat{k}$. Its velocity at $\left(x_0, y_0, 0\right)$ is $4 \hat{i}+3 \hat{j}$. The value of $x_0$ is

The electric field of an electromagnetic wave travelling through vaccum is given by the equation $E=E_0 \sin (k x-\omega t)$. The quantity that is independent of wavelength is

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : EM waves used for optical communication have longer wavelengths than that of microwave, employed in Radar technology.
Reason R : Infrared EM waves are more energetic than microwaves, (used in Radar)
In the light of given statements, choose the correct answer from the options given below.

Statement I: The magnetic flux through a closed surface is zero

Statement II: Gauss's law applies in the case of electric flux only

The direction of propagation of electromagnetic wave is along

The amplitude of an electromagnetic wave in vacuum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is true?

The amplitudes of electric and magnetic fields in an electromagnetic wave are related to each other as

Statement I: Ultra violet radiations being higher frequency waves are dangerous to human beings.

Statement II: Ultraviolet radiations are absorbed by the atmosphere

Assertion: Dipole oscillations produce electromagnetic waves

Reason: Accelerated charge produces electromagnetic waves

A plane electromagnetic wave is traveling in vacuum in X-direction. The plane in which
magnetic field propagates is

Statement I: Electromagnetic waves exert pressure, called radiation pressure.

Statement II: Electromagnetic waves carry energy.

In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption

An electromagnetic wave with frequency $\omega$ and wavelength $\lambda$ travels in the $+y$ direction. Its magnetic field is along $+x-$ axis. The vector equation for the associated electric field (of amplitude $E_0$ ) is

Which scientist experimentally proved the existence of electromagnetic waves

If ${\mathrm{\varepsilon }_0}\mathrm{\;and\;}{\mathrm{\mu }_0}$ are the electric permittivity and magnetic permeability of free space and $\mathrm{\varepsilon \;and\;\mu }$ are the corresponding quantities in the medium, the index of refraction of the medium in terms of above parameter is

In free space, the energy of electromagnetic wave in electric field is ${U_E}$ and in magnetic field is ${U_B}$. Then

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to :

During the propagation of electromagnetic waves in a medium

Choose the correct option relating wavelengths of different parts of electromagnetic wave spectrum

The pressure exerted by an electromagnetic wave of intensity I $\left(\mathrm{Wm}^{-2}\right)$ on a non-reflecting surface is ( $C$ is the velocity of light)

Displacement current is a source of