An electromagnetic wave is transporting energy in the negative z direction. At a certain point and certain time the direction of electric field of the wave is along positive y direction. What will be the direction of the magnetic field of the wave at that point and instant?

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Positive direction of x

Positive direction of z

Negative direction of x

Negative direction of y

answer is A.

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Detailed Solution

As, pointing vector $\vec{S} = \vec{E} \times \vec{H}$

Given energy transport = negative z direction

Electric field = positive y direction

$(- \hat{k}) = (+ \hat{j}) \times [\hat{i}]$

Hence according to vector cross product magnetic field should be positive $x$ direction.

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