light wave travelling along y-direction. if the corresponding E vector at any time is along x-axis,the direction of B vector at that time is along
1. z axis    2.  negative z axis

z axis
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E X B  cross product will give direction of wave  so it i X -K = j

so -ve z axis
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Direction is given by E vector cross B vector .....it means i cap cross j cap which is -k cap So direction is along -z axis ....
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