$\frac{E_{i}}{B_{i}}=C.........(1)$ $\frac{E_{f}}{B_{f}}=\frac{c}{n}.........(2)$ $ \Rightarrow \frac{{{E_i}{B_f}}}{{{E_f}}} = \frac{1}{n}$ $

$\,\left( {\sqrt n ,\frac{1}{{\sqrt n }}} \right)$

$\frac{E_{i}}{B_{i}}=C.........(1)$ $\frac{E_{f}}{B_{f}}=\frac{c}{n}.........(2)$ $ \Rightarrow \frac{{{E_i}{B_f}}}{{{E_f}}} = \frac{1}{n}$ $ \Rightarrow \frac{{{E_i}}}{{{E_f}}} = \frac{1}{n}\frac{{{B_i}}}{{{B_f}}}$ $\left( {\because \,n = \frac{1}{{\sqrt {{\mu _0}{e_r}} }}} \right)$ $\frac{1}{{\sqrt n }}:\sqrt n $

8.Electromagnetic wavesDifficult

An electromagnetic wave of intensity $50\,Wm^{-2}$ enters in a medium of refractive index $’ n’$ without any loss . The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively. Given by

[JEE MAIN 2019]

A
$\left( {\frac{1}{{\sqrt n }},\frac{1}{{\sqrt n }}} \right)$
B
$\left( {\sqrt n ,\sqrt n } \right)$
C
$\left( {\frac{1}{{\sqrt n }},\sqrt n } \right)$
D
$\,\left( {\sqrt n ,\frac{1}{{\sqrt n }}} \right)$

Std 12
Physics

Wavelength of light of frequency $100\;Hz$

Easy

[AIPMT 1999]

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The nature of electromagnetic wave is :-

Easy

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An electron is constrained to move along the $y-$axis with a speed of $0.1\, c$ (c is the speed of light) in the presence of electromagnetic wave, whose electric field is $\overrightarrow{ E }=30 \hat{ j } \sin \left(1.5 \times 10^{7} t -5 \times 10^{-2} x \right)\, V / m$ The maximum magnetic force experienced by the electron will be: (given $c=3 \times 10^{8}\, ms ^{-1}$ and electron charge $\left.=1.6 \times 10^{-19} C \right)$

Medium

[JEE MAIN 2020]

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A monochromatic beam of light has a frequency $v = \frac{3}{{2\pi }} \times {10^{12}}\,Hz$ and is propagating along the direction $\frac{{\hat i + \hat j}}{{\sqrt 2 }}$. It is polarized along the $\hat k$ direction. The acceptable form for the magnetic field is

Difficult

[JEE MAIN 2018]

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For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field $(E)$ and magnetic field $(B)$ respectively?

Medium

[NEET 2021]

View Solution

An electromagnetic wave of intensity $50\,Wm^{-2}$ enters in a medium of refractive index $’ n’$ without any loss . The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively. Given by

Similar Questions

Wavelength of light of frequency $100\;Hz$

The nature of electromagnetic wave is :-

A monochromatic beam of light has a frequency $v = \frac{3}{{2\pi }} \times {10^{12}}\,Hz$ and is propagating along the direction $\frac{{\hat i + \hat j}}{{\sqrt 2 }}$. It is polarized along the $\hat k$ direction. The acceptable form for the magnetic field is

For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field $(E)$ and magnetic field $(B)$ respectively?