Electromagnetic Waves

This is a short answer type question as classified in NCERT Exemplar

As we know radiant flux density S=  $\frac{1}{{\mu }_0}$ (E $\times B$ )= c^{2 $?$} ₀(E $\times B$ )

Suppose electromagnetic waves be propagating along x-axis. The electric field vector of

Electromagnetic wave be along y-axis and magnetic field vector be along z-axis. Theref

This is a short answer type question as classified in NCERT Exemplar

(i) Microwave is used in satellite communications. So, λ1 is the wavelength of microwave.

(ii) Ultraviolet rays are used to kill germs in water purifier. So, λ2 is the wavelength of UV rays.

(iii) X-rays are used to detec

This is a short answer type question as classified in NCERT Exemplar

Magnetic field induction at a point in a region between two plates of a parallel plate capacitor is

B= $\frac{{\mu }_{0}2I_d}{4\pi r}$ = $\frac{{\mu }_0{I}_d}{2\pi r}$ = $\frac{{\mu }_0}{2\pi r}?$ 0 $\frac{d{\varnothing }_E}{dt}$

= $\frac{{\mu }_{0{?}_0}}{2\pi r}\frac{d}{dt}$  (E $\pi r^2$ ) = $\frac{{\mu }_{0{?}_0}}{2\pi r}\pi r^2\frac{d}{dt}$  (E)

B= $\frac{{\mu }_{0{?}_{0r}}}{2\pi r}\frac{d}{dt}$  (E)

This is a short answer type question as classified in NCERT Exemplar

An electromagnetic wave carries energy and momentum like other waves.

Since, it carries momentum, an electromagnetic wave also exerts pressure called radiation pressure. This property of electromagnetic waves helped professor CV Rama

This is a short answer type question as classified in NCERT Exemplar

Consider and electromagnetic waves, let E be varying along y-axis, B is along z-axis and propagation of wave be along x-axis. Then E×B will tell the direction of propagation of

energy flow in electromagnetic wave, along x-axis.

E= E₀s

This is a short answer type question as classified in NCERT Exemplar

Aaverage magnetic energy density I_av= $\frac{1}{2}\frac{B^2}{{\mu }_0}$ c

From eqn we know that B=12 $\times {10}^{-8}$

= $\frac{1}{2}\times \frac{({12\times {10}^{-8})}^2\times 3\times {10}^8}{4\pi \times {10}^{-7}}$ = 1.71W/m²

This is a short answer type question as classified in NCERT Exemplar

X_c=1/2 $\pi fc$

And displacement current is inversely proportional to X_c so when capacitive reactance increases then displacement current will decrease.

This is a short answer type question as classified in NCERT Exemplar

I_d=I_c= dq/dt

And q=q₀ cos 2πvt

By putting this in above equation I_d=I_c= q₀ sin2πvt $\times$ 2 $\pi \upsilon$

This is a short answer type question as classified in NCERT Exemplar

Microwave oven heats up the food items containing water molecules most efficiently because the frequency of microwaves matches the resonant frequency of water molecules.

This is a short answer type question as classified in NCERT Exemplar

The orientation of the portable radio with respect to broadcasting station is important because the electromagnetic waves are plane polarised, so the receiving antenna should be parallel to the vibration of the electric or magnetic