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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.
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.
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