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Question
The diagram below shows the electric field (E) and magnetic field (B) components of an electromagnetic wave at a certain time and location.
The direction of the propagation of the electromagnetic wave is ______.
Options
perpendicular to E and B and out of plane of the paper.
perpendicular to E and B and into the plane of the paper.
parallel and in the same direction as E.
parallel and in the same direction as B.
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Solution
The direction of the propagation of the electromagnetic wave is perpendicular to E and B and out of plane of the paper.
Explanation:
Direction of propagation of the electromagnetic wave is given by `vec"E" xx vec"B"`. Here `vec"B"` is along the +X axis. `vec"E"` is along the -Y axis. So, applying the right-hand rule, the propagation of the electromagnetic wave is perpendicular to `vec"E"` and `vec"B"` and out of plane of the paper.
