A plane electromagnetic wave of frequency 30 MHz travels in free space along the x-direction. At a particular point in space and time $\vec E = 6.3\hat j\, V/m$. The $\vec B$ at this point would be:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $2.1 × 10^{-8}\hat k\, T$
Electric field ($\vec E$) and Magnetic field ($\vec B$) is related by -
$C=\frac{\vec E}{\vec B}$ where $[C=3×10^8m/s]$
$\vec B=\frac{6.3}{3×10^8}$
$=2.1 × 10^{-8}\hat k\, T$