If $\overrightarrow{\mathrm{E}}$ and $\overrightarrow{\mathrm{K}}$ represent electric field and propagation vectors of the EM waves in vacuum, then magnetic field vector is given by: ( $\omega$ - angular frequency) :

• Correct answer
  A

  $\frac{1}{\omega}(\overrightarrow{\mathrm{K}} \times \overrightarrow{\mathrm{E}})$
• B

  $\omega(\overrightarrow{\mathrm{E}} \times \overrightarrow{\mathrm{K}})$
• C

  $\omega(\overrightarrow{\mathrm{K}} \times \overrightarrow{\mathrm{E}})$
• D

  $\overrightarrow{\mathrm{K}} \times \overrightarrow{\mathrm{E}}$

Hence, the correct answer is option: 'A'.