Assertion : In electromagnetic waves electric field and magnetic field lines are perpendicular to each other. Reason : Electric field and magnetic field are self sustaining.

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Electromagnetic waves are those waves in which there are sinusoidal variation of electric and magnetic field vectors at right angles to each other as well as at right angles to the direction of wave propagation. They are self-sustaining oscillations of electric and magnetic fields in free space or vacuum.

Physics - EM Waves Question with Solution | TestHub

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