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At a particular moment in time and space, we measure an electromagnetic wave's electric and magnetic...

At a particular moment in time and space, we measure an electromagnetic wave's electric and magnetic fields. We find the electric field →E pointing Up and the magnetic field →B pointing West. What is the direction of wave propagation? West, Up, North, South, or East?

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Answer #1

The vector product E x B is in the direction of the propagation of the wave.
Therefore direction of wave propagation is, South.

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