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PRACTICE / Electromagnetic wave speed

The magnetic part of a light wave

A plane electromagnetic wave in vacuum has peak electric field 150 V/m.

Find its peak magnetic field.

Organize the givens & assumptions
  • E₀ = 150 V/m
  • c = 3×10⁸ m/s

Plane electromagnetic wave in vacuum; both stated fields are peak amplitudes; c = 3 × 10⁸ m/s.

  1. A5×10−7/2 T5\times10^{-7}/\sqrt2\ \mathrm T
  2. B5×10−6 T5\times10^{-6}\ \mathrm T
  3. C5×10−7 T5\times10^{-7}\ \mathrm T
  4. D4.5×1010 T4.5\times10^{10}\ \mathrm T

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