Discussion
A plane wave has an electric field amplitude of 10 V/m in free space. Its magnetic field amplitude is about
Answer: A
Dividing by the intrinsic impedance gives \( 10/377 = 2.65 \times 10^{-2} \) A/m. The great disparity in the numerical values is entirely an artefact of the units chosen, the two fields carrying equal energy densities in a plane wave.
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