Electromagnetic waves practice · Mixed difficulty

The infra-red spectrum lies between

If a free electron is placed in the path of a plane electromagnetic wave, it will start moving along

Which of the following electromagnetic waves have minimum frequency

A plane EM wave is propagating along $x$ direction. It has a wavelength of $4 \mathrm{~mm}$. If electric field is in $y$ direction with the maximum magnitude of $60 \mathrm{~Vm}^{-1}$, the equation for magnetic field is:

Statement I: Microwaves have more energy than the radio waves

Statement II: Microwaves have greater wavelength than the radiowaves

A plane electromagnetic wave of frequency $35 {MHz}$ travels in free space along the $X$-direction. At a particular point (in space and time) $\vec{E}=9.6 \hat{j} {~V} / {m}$. The value of magnetic field at this point is :

Which of the following rays is emitted by a human body?

A point source is placed at origin. Its intensity at distance of $2 \mathrm{~cm}$ from source is $I$ then intensity at distance $4 \mathrm{~cm}$ from the source shall be.

Ozone layer blocks the radiations of wavelength

An EM wave from air enters a medium. The electric fields are ${E_1} = {E_{01}}\hat x\cos \left[ {2\pi v\left( {\frac{z}{c} - t} \right)} \right]$ in air and ${E_2} = {E_{02}}\hat x\cos \left[ {k\left( {2z - ct} \right)} \right]$ in medium, where the wave number k and frequency ν refer to their values in air. The medium is non-magnetic.
If ${\varepsilon _{{r_1}}}$ and ${\varepsilon _{{r_2}}}$ refer to relative permittivities of air and medium respectively, which of the following options is correct?

Radio waves and visible light in vacuum have

The magnetic field of a beam emerging from a filter facing a floodlight is given by

$\mathrm{B}_0=12 \times 10^{-8} \sin ( 1.20 \times 10^7 \mathrm{z} \left.-3.60 \times 10^{15} \mathrm{t}\right) \mathrm{T}$.

What is the average intensity of the beam?

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

In the case of a photon :-

A parallel plate capacitor of plate separation 2 mm is connected in on electric circuit having source voltage 400 volts. It the plate area is $60\,c{m^2}$, then the value of displacement current for ${10^{ - 6}}$ sec. will be

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