Question

A plane electromagnetic wave of frequency $25$ MHz travels in free space along x - direction. At a particular point in space and time $E=6jV/m$, then B and its frequency at this point will be

• A. $2\times {10}^{-8}\hat{k}T$
• B. $2.1\times {10}^{-8}\hat{k}T$
• C. $18.9\times {10}^{-8}\hat{k}T$
• D. $2.2\times {10}^{-8}\hat{k}T$

Answer 1

The correct option is A $2\times {10}^{-8}\hat{k}T$

$\begin{array}{c}Given\\ E=6Jv/m\\ \therefore B=\frac{E}{C}=\frac{6}{3\times {10}^8}=2\times {10}^{-8}\hat{K}T\end{array}$

Hence, the option $A$ is the correct answer.