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  4. In an electromagnetic wave, the electric field oscillates sinusoidally with amplitude 48 Vm -1. The RMS value of oscillating magnetic field will be

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Q. In an electromagnetic wave, the electric field oscillates sinusoidally with amplitude $48\, Vm ^{-1}$. The RMS value of oscillating magnetic field will be

Electromagnetic Waves

Solution:

$B_{0}=\frac{E_{0}}{c}=\frac{48}{3 \times 10^{8}}=16 \times 10^{-8} T$
$B_{ rms }=\frac{B_{0}}{\sqrt{2}}=\frac{16 \times 10^{-8}}{\sqrt{2}}$
$=8 \sqrt{2} \times 10^{-8} T$