NEET UG PHYSICS MCQ: ELECTROMAGNETIC WAVES

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Application +4 | -1

The electric field associated with an EM wave in vaccum is given by

E = \hat i40\,\cos \left( {KZ - 6 \times {{10}^8}t} \right)

where

{E_1}

Z

and

t

are in volt/m, metre and secants respectively. The value of wave vector k is

View answer and explanation

Correct option: A

2\,\,{m^{ - 1}}

Option A (

2\,\,{m^{ - 1}}

) is correct because the wave vector k is calculated from the angular frequency and the speed of light.

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{E_X}

{E_R}

{E_M}

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

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

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

{\varepsilon _{{r_1}}}

{\varepsilon _{{r_2}}}

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

c

\mathrm{\varepsilon }

\mathrm{\mu }

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