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At a certain instant in time, the electric field of an electromagnetic wave in free space...

At a certain instant in time, the electric field of an electromagnetic wave in free space points in the -z direction, and the magnetic field points in the +y direction. In what direction is this wave traveling?

A) +x direction ___B) -x direction ___ C) +y direction ___D) -z direction ___E) +z direction ___

Please explain why you chose your answer

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