Poynting vector and fields

Electricity and Magnetism Level 2

What is the equation of the electric field component of an electromagnetic wave with magnetic field component

$\vec{B} = B_m\hat{z} \sin(ky + \omega t)?$

\vec{E} = c B_m\hat{x} \sin(ky + \omega t)

\vec{E} = \frac{B_m}{c}\hat{x} \sin(ky + \omega t)

\vec{E} = \frac{B_m}{c}\hat{z} \sin(ky + \omega t)

\vec{E} = c B_m\hat{z} \sin(ky + \omega t)

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