JEE Main 2025 — Electromagnetic Waves Question with Solution
JEE Main 2025 (28 Jan Shift 2)
Question
The magnetic field of an E.M. wave is given by (S.I. Units).
The corresponding electric field in S.I. units is :
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
$\begin{aligned}
& \overrightarrow{\mathrm{B}}=\left(\frac{\sqrt{3}}{2} \hat{\mathrm{i}}+\frac{1}{2} \hat{\mathrm{j}}\right) 30 \sin \left[\omega\left(\mathrm{t}-\frac{\mathrm{z}}{\mathrm{c}}\right)\right] \\
& \overrightarrow{\mathrm{E}}=\overrightarrow{\mathrm{B}} \times \overrightarrow{\mathrm{c}} \text { and } \mathrm{E}=\mathrm{B}_0 \mathrm{c}
\end{aligned}$
Here
$\begin{aligned}
& \mathrm{E}_0=30 \mathrm{c} \\
& \overrightarrow{\mathrm{E}}=\left(\frac{1}{2} \hat{\mathrm{i}}-\frac{\sqrt{3}}{2} \hat{\mathrm{j}}\right) 30 \mathrm{c} \sin \left[\omega\left(\mathrm{t}-\frac{\mathrm{z}}{\mathrm{c}}\right)\right]
\end{aligned}$
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This is a previous-year question from JEE Main 2025, covering the Electromagnetic Waves chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.