JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES

1 Medium

1 of 1

Application +4 | -1

A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along

y -

direction. At a particular point in space and time,

\overrightarrow B = 8.0 \times {10^{ - 8}}\widehat zT

. The value of electric field at this point is:
(speed of light

= 3 \times {10^8}m{s^{ - 1}}

\widehat x,\widehat {\,y},\widehat {\,z}

are unit vectors along

x,\,y

and

z

directions.

View answer and explanation

Correct option: D

- 24\,\,\widehat x\,\,\mathrm{V/m}

Option D (

-24\,\,\widehat x\,\,\mathrm{V/m}

) is correct because the electric field is calculated using the relationship E = Bc and the direction is determined by the direction of wave propagation.

More Questions from ELECTROMAGNETIC WAVES

Practice All Chapter MCQs →

Statement I: Sound waves are not electromagnetic waves.

Statement II: Sound waves require a material medium for propagation. 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? Assertion: The relative velocity of two photons travelling in opposite directions is the velocity of light.

Reason: The rest mass of photon is zero Intensity of electromagnetic wave will be The rms value of the electric field of the light coming from the Sun is

720\;N/C

. The average total energy density of the electromagnetic wave is Methane is a greenhouse gas because