8.Electromagnetic waves
medium

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

A

$\pi \times 10^{-3} \;m$

B

$\pi \times 10^{3} \;m$

C

$2 \times 10^{-3} \;m$

D

$2 \times 10^{3} \;m$

(NEET-2020)

Solution

$B_{y}=2 \times 10^{-7} \sin \left(\pi \times 10^{3} x+3 \pi \times 10^{11} t \right) T$

General equation of magnetic field vector

$B = B _{0} \sin ( k x+\omega t ) T$

$k=\pi \times 10^{3}$

$\frac{2 \pi}{\lambda}=\pi \times 10^{3}$

$\lambda=2 \times 10^{-3} m$

Standard 12
Physics

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