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  4. The figure here gives the electric field of an EM wave at a certain point and at certain instant. The wave is transporting energy in the negative Z direction. What is the direction of the magnetic field of the wave at that point and instant?

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Q. The figure here gives the electric field of an $EM$ wave at a certain point and at certain instant. The wave is transporting energy in the negative $Z$ direction. What is the direction of the magnetic field of the wave at that point and instant?Physics Question Image

Electromagnetic Waves

Solution:

The direction of EM wave is given by the direction of $\vec{E} \times \vec{B}$