Verified Solution • 2025–26 Session moderate

QJEEM23Phb223: JEE Main 2023 Physics - Class 12 JEEM23Phb223 Solution: In and represent electric field and propagation vectors of the…

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

( ω\omega - angular frequency) :

Multiple Choice Options

  • A 1ω(K‾×E‾){1 \over \omega }\left( {\overline K \times \overline E } \right)
  • B K‾×E‾\overline K \times \overline E
  • C ω(K‾×E‾)\omega \left( {\overline K \times \overline E } \right)
  • D ω(E‾×K‾)\omega \left( {\overline E \times \overline K } \right)

Step-by-Step Verified Solution

Magnetic field vector will be in the direction of K^×E^\hat{\mathrm{K}} \times \hat{\mathrm{E}}

magnitude of B=EC=KωEB=\frac{E}{C}=\frac{K}{\omega} E

Or B→=1ω(K→×E→)\overrightarrow{\mathrm{B}}=\frac{1}{\omega}(\overrightarrow{\mathrm{K}} \times \overrightarrow{\mathrm{E}})

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