Physics · Electromagnetic Waves

JEE Main 2026 — 6 April, Evening Shift — Question 5

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:

Option A:
$\frac{\vec{E}\times\vec{k}}{\omega}$
Option B:
$\frac{\vec{k}\times\vec{E}}{\omega}$
Correct
Option C:
$\omega(\vec{E}\times\vec{k})$
Option D:
$\omega(\vec{k}\times\vec{E})$

Answer: B

Step-by-step solution

$\vec{B} = \frac{1}{\omega}(\vec{k}\times\vec{E})$ .

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 6 April, Evening Shift
Subject: Physics
Chapter: Electromagnetic Waves
Topic: Displacement Current and Equation of EM Waves