The electric field of a plane electromagnetic wave propagating along the direction in…

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Waves · Electromagnetic Waves

Problem

The electric field of a plane electromagnetic wave propagating along the

x

direction in vacuum is

\vec{E} = E_0 \hat{j} \cos(\omega t - kx)

. The magnetic field

\vec{B}

, at the moment

t = 0

is : (1)

\vec{B} = \frac{E_0}{\sqrt{\mu_0 \epsilon_0}} \cos(kx) \hat{k}

(2)

\vec{B} = E_0 \sqrt{\mu_0 \epsilon_0} \cos(kx) \hat{j}

(3)

\vec{B} = E_0 \sqrt{\mu_0 \epsilon_0} \cos(kx) \hat{k}

(4)

\vec{B} = \frac{E_0}{\sqrt{\mu_0 \epsilon_0}} \cos(kx) \hat{j}