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Originally Posted by GUILLE What states that they are perpendicular to each other? |
The principle of orthogonality. Complementarity of the trigonometric functions of sine and cosine. The orthogonality of eigenvectors in eigenvalue problems. The perpendicular planes of electric and magnetic field of electromagnetic radiation. If the electric and magnetic field vectors are not perpendicular then the Poynting vector of radiation is null meaning no propagation is possible.