JEE PHYSICS MCQ: ELECTROMAGNETIC WAVES

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Application +4 | -1

An electromagnetic wave with frequency

\omega

and wavelength

\lambda

travels in the

+y

direction. Its magnetic field is along

+x-

axis. The vector equation for the associated electric field (of amplitude

E_0

) is

View answer and explanation

Correct option: C

\vec{E}=E_0 \cos \left(\omega t-\frac{2 \pi}{\lambda} y\right) \hat{z}

Option C (

\vec{E}=E_0 \cos \left(\omega t-\frac{2 \pi}{\lambda} y\right) \hat{z}

) is correct because it represents an electromagnetic wave traveling in the +y direction with the magnetic field along the +x axis, thus the electric field must be along the +z axis and in phase.

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