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JEE Main 2026 (6 Apr, Shift 2) · Nature of EM Waves & Wave Equation

Nature of EM Waves & Wave Equation question from JEE Main 2026 (6 Apr, Shift 2)

Q2JEE Main 2026 · 6 APR · SHIFT 2Medium

Nature of EM Waves & Wave Equation

For an electromagnetic wave propagating through vacuum, $\vec{k}, \vec{E}$ and $\omega$ represent propagation vector, electric field and angular frequency, respectively. The magnetic field associated with this wave is represented by:

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Answer: (b)

From Faraday's law for a plane wave, $\vec k\times\vec E = \omega\vec B$ .
Check: $|B| = kE/\omega = E/c$ and $\vec E\times\vec B$ is along $\vec k$ .
So the answer is (b) $\dfrac{\vec k\times\vec E}{\omega}$ .

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