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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 timeE=6.3j^ V/m. What is B at this point ? 

Explanation:

The magnitude of B is 

B=Ec

   =6.3V/m3×108 m/s=2.1×10-8T

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, +j^×+k=i^ , B is along the z- direction.

Thus, B=2.1×10-8k T.

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