Medium MCQ +4 / -1 PYQ · JEE Mains 2023

In $\overrightarrow E$ and $\overrightarrow K$ represent electric field and propagation vectors of the EM waves in vacuum, then magnetic field vector is given by :

($\omega$ - angular frequency) :

  1. A ${1 \over \omega }\left( {\overline K \times \overline E } \right)$ Correct answer
  2. B $\overline K \times \overline E$
  3. C $\omega \left( {\overline K \times \overline E } \right)$
  4. D $\omega \left( {\overline E \times \overline K } \right)$

Solution

Magnetic field vector will be in the direction of $\hat{\mathrm{K}} \times \hat{\mathrm{E}}$<br/><br/> magnitude of $B=\frac{E}{C}=\frac{K}{\omega} E$<br/><br/> Or $\overrightarrow{\mathrm{B}}=\frac{1}{\omega}(\overrightarrow{\mathrm{K}} \times \overrightarrow{\mathrm{E}})$

About this question

Subject: Physics · Chapter: Electromagnetic Waves · Topic: Properties of EM Waves

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