NEET UG PHYSICS MCQ: ELECTROMAGNETIC WAVES

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Application +4 | -1

A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the

x

-direction. At a particular point in space and time,

B\, = 2.0 \times {10^{ - 8}}\widehat kT

(where,

\widehat k

is unit vector along

z

-direction). What is

E

at this point?

View answer and explanation

Correct option: C

6.0\,\widehat j\,V/m

Option C (

6.0\,\widehat j\,V/m

) is correct because the electric field is related to the magnetic field by

E = cB

and the direction is given by the Poynting vector.

More Questions from ELECTROMAGNETIC WAVES

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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 }}}