A plane electromagnetic wave propagating in the x-direction has wavelength of 60 mm. The electric field is in the y-direction and its maximum magnitude is 33 V/$m^{-1}$. The equation for the electric field as function of x and t is

Light with an energy flux of 20 W/${\mathrm{cm}}^2$ falls on a non-reflecting surface at normal incidence. If the surface has an area of 30 ${\mathrm{cm}}^2$, the momentum delivered (for complete absorption) during 30 min is:

The magnetic field in the plane electromagnetic wave is given by

${\mathrm{B}}_{\mathrm{z}}=2\times {10}^{-7} \sin (0.5\times {10}^3\mathrm{x}-1.5\times {10}^{11}\mathrm{t}) \mathrm{tesla}$

The expression for the electric field will be

For a transparent medium relative permeability and permittivity, ${\mu }_r and {\epsilon }_r$ are  1.0 and 1.44 respectively. The velocity of light in this medium would be:

What is the energy density of electric field at a distance of 5 m from a point source of EM wave, if the electric field strength at that point be 100 V/m ?

Which one of the following rays (or waves) has maximum speed in air?

Which of the following phenomenon proves the transverse nature of electromagnetic waves?

The impulse imparted by an electromagnetic pulse of energy 1.5 x 10^-2 joule when it falls normally on a perfectly reflecting surface is

The electric field vector of an electromagnetic wave is given by, $\overrightarrow{E}$=$E_0\sin (\omega t-kx)\hat{j}$

The corresponding expression for magnetic field is

$$\begin{gathered} 1. \overrightarrow{B}=B_0 \sin (\omega t+kx)\hat{k} \\ 2. \overrightarrow{B}=B_0 \sin (\omega t-kx)\hat{k} \\ 3. \overrightarrow{B}=-B_0 \sin (\omega t+kx)\hat{k} \\ 4. \overrightarrow{B}=-B_0 \sin (\omega t-kx)\hat{k} \end{gathered}$$

Electromagnetic waves are produced by

Figure shows a parallel plate capacitor being charged by a battery. If X and Y are two closed curves then during charging $\oint \overrightarrow{B}.d\overrightarrow{l}$ is zero along the curve

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : (c = speed of electromagnetic waves)

Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having surface area 20 cm² . The energy received by the surface during time span of 1 minute is : 

A capacitor is made of two circular plates each of radius 12 cm and separated by 5.0 cm. The capacitor is being charged by an external source. The charging current is constant and equal to 0.15 A. The displacement current across the plates is:

A parallel plate capacitor made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V AC supply with an (angular) frequency of 300 rad/s. The amplitude of $\overrightarrow{B}$ at the point 3 cm from the axis between the plate is:

A plane electromagnetic wave travels in a vacuum along the z-direction. Then the directions of its electric and magnetic field vectors will be in:

A radio can tune in to any station in the 7.5 MHz to 12 MHz bands. What is the corresponding wavelength band?

 A charged particle oscillates about its mean equilibrium position with a frequency of ${10}^9 Hz.$ What is the frequency of the electromagnetic waves produced by the oscillator?

$$\begin{gathered} \left(1\right) {10}^{11} Hz \\ \left(2\right) {10}^7 Hz \\ \left(3\right) {10}^8 Hz \\ \left(4\right) {10}^9 Hz \end{gathered}$$

Which physical quantity does not change in vacuum for X-rays?

The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $B_0= 510 nT$. What is the amplitude of the electric field part of the wave?

The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is:

Suppose that the electric field amplitude of an electromagnetic wave is $E_0 =120 N/C$ and that its frequency is $\nu =50.0 MHz$. The value of k is:

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0\times {10}^{10} Hz$ and amplitude 48 V/m. What is the amplitude of the oscillating magnetic field?

$$\begin{gathered} \left(1\right) 4.2\times {10}^{-8} T \\ \left(2\right) 2.4\times {10}^{-7} T \\ \left(3\right) 3.8\times {10}^{-8} T \\ \left(4\right) 1.6\times {10}^{-7} T \end{gathered}$$

The electric field part of an electromagnetic wave in vacuum is- 

$$\begin{gathered} \overrightarrow{\mathrm{E}}= \\ \left( 3.1 N/C\right) \cos \\ \left[\left(1.8 rad/m\right)y+\left(5.4\times {10}^8 rad/s\right)t\right]\hat{i} \end{gathered}$$

What is the frequency of the wave?

$\begin{array}{rcl}& & 1. 5.7\times {10}^7 Hz\\ & & 2. 9.3\times {10}^7 Hz\\ & & 3. 8.6\times {10}^7 Hz\\ & & 4. 7.5\times {10}^7 Hz\end{array}$

If an electromagnetic wave propagating through vacuum is described by ${\mathrm{E}}_{\mathrm{y}}={\mathrm{E}}_0 \sin (\mathrm{kx}-\mathrm{\omega } \mathrm{t})$; ${\mathrm{B}}_{\mathrm{z}}={\mathrm{B}}_0 \sin (\mathrm{kx}-\mathrm{\omega } \mathrm{t})$, then

A charged particle oscillates about its mean equilibrium position with a frequency of ${10}^9 \mathrm{Hz}$. The electromagnetic waves produced:

(a) will have frequency of ${10}^9 \mathrm{Hz}$
(b) will have frequency of $2\times {10}^9 \mathrm{Hz}$
(c) will have wavelength of 0.3 m
(d) fall in the region of radiowaves

The source of electromagnetic waves can be a charge:

(a) moving with a constant velocity
(b) moving in a circular orbit
(c) at rest
(d) falling in an electric field

An EM wave of intensity I falls on a surface kept in a vacuum and exerts radiation pressure p on it. Which of the following are true?

(a) Radiation pressure is  $\frac{\mathrm{I}}{\mathrm{c}}$ if the wave is totally absorbed.
(b) Radiation pressure is $\frac{\mathrm{I}}{\mathrm{c}}$ if the wave is totally reflected.
(c) Radiation pressure is $\frac{2\mathrm{I}}{\mathrm{c}}$ if the wave is totally reflected.
(d) Radiation pressure is in the range $\frac{\mathrm{I}}{\mathrm{c}}$< P <$\frac{2\mathrm{I}}{\mathrm{c}}$ for real surfaces.

One requires 11 eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in:

A linearly polarised electromagnetic wave given as $\mathrm{E}={\mathrm{E}}_0 \hat{\mathrm{i}} \cos (\mathrm{kz}-\mathrm{\omega t})$ is incident normally on a perfectly reflecting infinite wall at z = a. Assuming that the material of the wall is optically inactive, the reflected wave will be given as: