Light travels in the positive x-direction. At a particular location and time the electric field points in the positive y-direction. In which direction is the magnetic field?
a) positive z-direction
b) negative z-direction
As we know that the direction of light travel = direction of electric field direction of magnetic field ('' denoted cross-product)
Here,
direction of light travel = positive x direction = + i
direction of electric field = positive y direction = + j
Therefore,
+i = +j direction of magnetic field
==> direction of magnetic field = + k = positive z-direction ==> ANSWER-(a)
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