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The magnetic field of a light wave oscillates parallel to a y axis and is given by by = bmsin(kz – ?t. (a in what direction does the wave travel?
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The magnetic field of a light wave oscillates parallel to a y axis and is given by by = bmsin(kz – ?t. (a in what direction does the wave travel?

User Oneself
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In this case the coordinate z is multiplied by your wave vector k, so it travels along z.  Note that the electric field will be oscillating along the x direction.  H and E are perpendicular to the direction of travel in vacuum.
User Rrejc
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