1. The problem statement, all variables and given/known data If the magnetic field of a light wave oscillates parallel to a y axis and is given by ##B_y = B_m\ sin(kz- \omega t)##, (a) in what direction does the wave travel and (b) parallel to which axis does the associated electric field oscillate? 2. Relevant equations 3. The attempt at a solution (a) The wave is propagating in the ##+ z##-direction because the form of the argument in the sinusoidal function. (b) I'm having problem here.