Electromagnetic Waves and Their Characteristics (Only Qualitative Ideas)

An electromagnetic wave is travelling in a medium with a velocity $\overrightarrow{v}=v\widehat{i}$ . The electric field oscillations, of this electromagnetic wave wave, are along the y – axis.

(a) Identify the direction in which the magnetic field oscillations are taking place, of the electromagnetic wave wave.

(b) How are the magnitudes of the electric and magnetic fields in the electromagnetic wave related to each other?

The electric field of a plane electromagnetic wave propagating along the z-axis varies with time with an amplitude of $2\mathrm{ }\mathrm{V} {\mathrm{m}}^{-1}$. The average energy density of the magnetic field (in $\mathrm{J}\mathrm{ }{\mathrm{m}}^{-3}$) is :

Take: ${\mathrm{\epsilon }}_0=8.854\times {10}^{-12} \mathrm{F} {\mathrm{m}}^{-1}$

Electric field amplitude of electromagnetic wave is $240 {\mathrm{NC}}^{-1}$ and frequency $50 \mathrm{MHz}$, if the wave is propagating along $\mathrm{x}-\mathrm{axis}$ then equation of wave for electric field is

Wavelength of electromagnetic wave $\mathrm{\beta }=8\times {10}^{-6} \sin \left(2\times {10}^{11}\mathrm{t}+300\mathrm{\pi x}\right)$ Tesla.

Electromagnetic waves propagating along $\mathrm{x}-\mathrm{axis}$, the equation for electric field along $\mathrm{y}-\mathrm{axis}$ is expressed as ${\mathrm{E}}_{\mathrm{y}}={\mathrm{E}}_0 \sin 2\mathrm{\pi }\left(\frac{\mathrm{x}}{\mathrm{\lambda }}-\frac{\mathrm{t}}{\mathrm{T}}\right)$, the wave vector is 

A laser beam $(\mathrm{\lambda }=633 \mathrm{nm})$ has an average power of $3 \mathrm{mW}$. What will be the pressure exerted on a surface by this beam if the cross-sectional area is $3 {\mathrm{mm}}^2$? (Assume perfect reflection and normal incidence.)

The magnetic field in a travelling electromagnetic wave has a peak value of $20nT$. The peak value of electric field strength is:

Pick the incorrect statement for electromagnetic waves?

Consider an electromagnetic wave propagating in vacuum. Choose the correct statement:

The electric field component of a monochromatic radiation is given by $\overrightarrow{E}=2E_0\widehat{i}\cos kz\cos \omega t$ ,Its magnetic field $\overrightarrow{B}$ is then given by:

An earth-orbiting satellite has a solar energy collecting panel with total area $5\mathrm{ }{\mathrm{m}}^2$. If solar radiations are perpendicular and completely absorbed, the average force associated with the radiation pressure is
(Solar constant$=1.4\mathrm{ }\mathrm{k}\mathrm{W} {\mathrm{m}}^{-2}$)

Consider an electromagnetic wave propagating in a vacuum. Choose the correct statement.

Magnetic field in a plane electromagnetic wave is given by

$\overrightarrow{B}=B_0\sin \left(kx+\omega t\right)\widehat{\mathrm{j}} \mathrm{T}$
Expression for the corresponding electric field will be:
where $c$ is the speed of light.

During the propagation of electromagnetic wave in a particular medium :-

A tube of length $30 \mathrm{cm}$ has its inner lateral surface blackened. Two lenses of focal lengths $10 \mathrm{cm}$ and $20 \mathrm{cm}$ are fixed at the ends of the tube. For same beam, intensities of spots on screen are $I_1$ and $I_2$ for arrangement $\left(1\right)$ and arrangement $\left(2\right)$. If the ratio of $I_2 : I_1$ is of the form $N^2\text{,}$ find $N$.

Calculate the amplitude of electric field (in $\mathrm{N} {\mathrm{C}}^{-1}$) in a parallel beam of light of intensity $4 \mathrm{W} {\mathrm{m}}^{-2}$.

Which of the following pairs of space and time-varying $E$ and $B$ fields would generate a plane electromagnetic wave travelling in the $(+x)$ direction?

Wavelength of EM waves varies from ______ to ________

The peak electric field produced by the radiation coming from the $8 \mathrm{W}$ bulb at a distance of $10 \mathrm{m}$ is $\frac{\mathrm{x}}{10}\sqrt{\frac{{\mathrm{\mu }}_0\mathrm{C}}{\mathrm{\pi }}}\frac{\mathrm{V}}{\mathrm{m}}$. The efficiency of the bulb is $10\%$ and it is a point source. The value of $\mathrm{x}$ is _____.