Question
Magnetic field in a plane electromagnetic wave is given by
$\vec B = {B_0}\,\sin \,\left( {kx + \omega t} \right)\hat jT$
Expression for corresponding electric field will be Where $c$ is speed of light
✓
Answer
Speed of $EM$ wave in force space $\left( c \right) = \frac{{{E_0}}}{{{B_0}}}\,$
or $\vec E = c{B_0}{\mkern 1mu} \sin {\mkern 1mu} \left( {kx + \omega t} \right)\hat k$
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