A plane electromagnetic wave of frequency $20 \mathrm{MHz}$ propagates in free space along $x$-direction. At a particular space and time $\overrightarrow{E}=6.6\widehat{j } \mathrm{V} {\mathrm{m}}^{-1}$. What is $\overrightarrow{B}$ at this point?

• Correct answer
  A

  $2.2\times {10}^{-8}\hat{k}\mathrm{T}$
• B

  $-2.2\times {10}^{-8}\hat{i}\mathrm{T}$
• C

  $-2.2\times {10}^{-8}\hat{k}\mathrm{T}$
• D

  $2.2\times {10}^{-8}\widehat{i }\mathrm{T}$

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