A light wave in air travels along +x with E⃗=540 sin[π×10⁴(x-ct)] ĵ V/m. Find the peak magnetic field. Take c=3×10⁸ m s⁻¹.
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Question

A light wave in air travels along +x with E⃗=540 sin[π×10⁴(x−ct)] ĵ V/m. Find the peak magnetic field. Take c=3×10⁸ m s⁻¹.

G1 Physics · Accepted Answer

For a plane wave in air, B₀=E₀/c=540/(3×10⁸)=1.8×10⁻⁶ T=18×10⁻⁷ T. Option A.