List of top Physics Questions on Electromagnetic waves asked in JEE Main

An $EM$ wave from air enters a medium. The electric fields are $\vec{E_1} = E_{01} \hat{x} \cos \left[ 2 \pi v\left( \frac{z}{c} - t \right) \right]$ in air and $\vec{E}_2 = E_{02} \hat{x} \cos [k (2 z - ct)]$ in medium, where the wave number $k$ and frequency $?$ refer to their values in air. The medium is non-magnetic . If $\in_{r_1} $ and $\in_{r_2} $ refer to relative permittivities of air and medium respectively, which of the following options is correct ?

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

For plane electromagnetic waves propagating in the $z$ direction, which one of the following combination gives the correct possible direction for $\vec{E}$ and $\vec{B}$ field respectively ?

Match List -1 (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists :

A lamp emits monochromatic green light uniformly in all directions. The lamp is $3\%$ efficient in converting electrical power to electromagnetic waves and consumes $100 \,W$ of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of $5 \,m$ from the lamp will be nearly :

During the propagation of electromagnetic waves in a medium,

A plane electromagnetic wave in a non-magnetic dielectric medium is given by $\vec{E}=\vec{E}_{0}\left(4\times10^{-7}\,x-50t\right)$ with distance being in meter and time in seconds. The dielectric constant of the medium is:

Select the correct statement from the following

A wave in a string has amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of $128{ms}^{-1}$ and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:

In an electromagnetic wave, the magnitude of electric and magnetic fields are 100 V/m and 0.265 A/m. The maximum energy flow is