JEE Main 2026 Apr 6 Shift 2, Physics Q6: Electromagnetic Waves

JEE Main2026Apr 6, Shift 2Physics

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

A
$\frac{E \times k}{ω}$
B
$\frac{k \times E}{ω}$
C
$ω (E \times k)$
D
$ω (k \times E)$

Solution

For a plane EM wave in vacuum, $E$ , $B$ and $k$ form a right-handed orthogonal triad with $B$ along $\hat{k} \times \hat{E}$ and magnitude $B = E / c$ .

Since $∣ k ∣ = ω / c$ , we can write $B = \frac{1}{ω} k \times E$ .

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JEE Main 2026 Apr 6 Shift 2, Physics Q6: Electromagnetic Waves

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