NEET UG PHYSICS MCQ: ELECTROMAGNETIC WAVES

1 Medium

1 of 1

Application +4 | -1

A plane EMW propagating in the X-direction has a wave length of 60 mm. The electric field is in the y-direction and its maximum magnitude is

33\,V{m^{ - 1}}

. The equation for the electric field as function of

x

and

t

View answer and explanation

Correct option: B

33\sin \pi \times {10^{ + 10}}\left[ {t - \frac{x}{c}} \right]

Option B is correct because it represents the electric field with the correct amplitude, wave number, and angular frequency derived from the given wavelength and maximum magnitude.

More Questions from ELECTROMAGNETIC WAVES

Practice All Chapter MCQs →

What is order of energy of X-rays (

{E_X}

), radio waves (

{E_R}

) and microwave (

{E_M}

)? The amplitude of the sinusoidally oscillating electric field of plane wave is

60\,\,\frac{V}{m}

. Then the amplitude of the magnetic field is An EM wave from air enters a medium. The electric fields are

{E_1} = {E_{01}}\hat x\cos \left[ {2\pi v\left( {\frac{z}{c} - t} \right)} \right]

in air and

{E_2} = {E_{02}}\hat x\cos \left[ {k\left( {2z - ct} \right)} \right]

in medium, where the wave number k and frequency ν refer to their values in air. The medium is non-magnetic.
If

{\varepsilon _{{r_1}}}

and

{\varepsilon _{{r_2}}}

refer to relative permittivities of air and medium respectively, which of the following options is correct? Electric field in a plane electromagnetic wave is given by

E = 50\sin \,(500x - 10 \times {10^{10}}t)\,v/m.

The velocity of electromagnetic wave in this medium is
(Given,

c

= speed of light in vacuum) If an electromagnetic wave is propagation in a medium with permeability 

\mathrm{\varepsilon }

and permittivity

\mathrm{\mu }

, then

\sqrt {\frac{\mathrm{\mu }}{\mathrm{\varepsilon }}}

is the In an E.M. wave the average energy density is associated with:-