Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 3: Level 3

Which of the following radiations has the least wavelength?

Two light waves are given by, $E_1=2\sin \left(100\pi t-kx+30°\right)$ and $E_2=3\cos \left(200\pi t-k^{\text{'}}x+60°\right)$
The ratio of intensity of first wave to that of second wave is:

The law which states that 'a variation in an electric field causes magnetic field', is

A parallel plate capacitor with plate area $A$ and separation between plates $d$, is charged by a constant current $i$. Consider a plane surface of area $\frac{A}{4}$ parallel to the plates and drawn symmetrically between the plates. The displacement current through this area is,

An EM wave from air enters a medium. The electric fields are ${\overrightarrow{E}}_1=E_{01}\hat{x}\cos \left[2\mathrm{\pi \nu }\left(\frac{z}{c}-t\right)\right]$ in air and ${\overrightarrow{E}}_2=E_{02}\hat{x}\cos \left[k\left(2z-ct\right)\right]$ in medium where the wave number $k$ and frequency $\nu$ refer to their values in air. The medium is non-magnetic. If ${\epsilon }_{r_1}$ and ${\epsilon }_{r_2}$ refer to relative permittivity of air and medium, respectively, which of the following options is correct?

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

Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar

Arrange the above in increasing frequency of the waves associated with them

The magnetic field amplitude of an electromagnetic wave is $2\times {10}^{-7} \mathrm{T}$. Its electric field amplitude if the wave is travelling in free space is