Question

The magnetic field in a plane electromagnetic wave is given by :
$B_{y}=2\times 10^{-7}\,sin (\pi \times 10^{3}x+3\pi\times 10^{11}t)T$
Calculate the wavelength

• A. $\pi \times 10^{3}\,m$
• B. $2 \times 10^{-3}\,m$
• C. $2 \times 10^{3}\,m$
• D. $\pi \times 10^{-3}\,m$

Answer 1

Answer: (B)

$\lambda=\frac{2\pi}{K}=\frac{2\pi}{\pi\times10^{3}}$
$\lambda=2\times10^{-3}\,m$