An electromagnetic wave travels in free space along the x -direction. At a particular point in space and time, vec B =2times10 -7 hat j T is associated with this wave. The value of corresponding electric field vec E at this point is V/m.

Physics · Electromagnetic Waves

JEE Main 2026 — 2 April, Evening Shift — Question 10

An electromagnetic wave travels in free space along the $x$ -direction. At a particular point in space and time, $\vec{B}=2\times10^{-7}\hat{j}\mathrm{T}$ is associated with this wave. The value of corresponding electric field $\vec{E}$ at this point is V/m.

Option A:
$60\hat{k}$
Option B:
$-60\hat{k}$
Correct
Option C:
$30\hat{k}$
Option D:
$-600\hat{k}$

Answer: B

Step-by-step solution

$\vec{E}=\vec{B}\times\vec{c} = (2\times10^{-7}\hat{j})\times(3\times10^8\hat{i}) = -60\hat{k}\mathrm{V/m}$

Answer key and solution verified before publishing.

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Exam: JEE Main 2026
Paper: 2 April, Evening Shift
Subject: Physics
Chapter: Electromagnetic Waves
Topic: Displacement Current and Equation of EM Waves