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A plane electromagnetic wave of frequency 25 MHz travel in free space along the x-direction. At a particular point in space and timeWhat is B at this point ?

Explanation:

The magnitude of B is

$B=\frac{E}{c}$

To find the direction, we note that E is along y-direction qand the wave propagated along x- axis. Therefore, B should be in a direction perpendicular to both x-direction. Since, $\left(+\stackrel{^}{j}\right)×\left(+k\right)=\stackrel{^}{i}$ , B is along the z- direction.

Thus, B=2.1$×$${10}^{-8}$k T.

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