Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 1: Level 1

The sound waves after being converted into electrical waves are not transmitted as such because -

Which of the following statement is true?

The velocity of electromagnetic wave is parallel to

Which of the following required no medium for propagation ?

If a light wave passes through a transparent medium (like as glass). Then :

$AC$ voltage $V\left(t\right)=20 \sin \omega t$ of frequency $50 \mathrm{Hz}$ is applied to a parallel plate capacitor. The separation between the plates is $2 \mathrm{mm}$ and the area is $1{ \mathrm{m}}^2$. The amplitude of the oscillating displacement current for the applied $AC$ voltage is $\left[\text{Take }{\mathrm{\epsilon }}_0=8.85\times {10}^{-12} \mathrm{F} {\mathrm{m}}^{-1}\right]$

Dimensions of ${ϵ}_0\frac{d{\varphi }_{ϵ}}{dt}$ are same as that of (symbols have their usual meanings) _________

Assertion : In an e.m. wave magnitude of magnetic field vector $\overrightarrow{B}$ is much smaller than the magnitude of vector $\overrightarrow{E}.$

Reason : This is because in an e.m. wave $\frac{E}{B}=c=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}.$