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JEE Main 2023 (25 Jan, Shift 1) · Nature of EM Waves & Wave Equation

Nature of EM Waves & Wave Equation question from JEE Main 2023 (25 Jan, Shift 1)

Q22JEE Main 2023 · 25 JAN · SHIFT 1Easy

Nature of EM Waves & Wave Equation

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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Answer: (c)

Propagation is along $\vec{E}\times\vec{B}$ , which must be $-\hat{k}$ .
With $\hat{E} = \hat{j}$ : $\hat{j}\times\hat{i} = -\hat{k}$ , so $\hat{B} = +\hat{i}$ .
So the answer is (c) positive x direction.

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