Question
An electromagnetic wave is propagating along Y-axis. Then.

Answer

  1. oscillating electric field is along Z-axis and oscillating magnetic field is along X-axis
Explanation:
electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vaccum. The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave. so if propogation is along Y-direction ,Electric field will be along X or Z, if it is along Z -direction than Magnetic field has to be in X -direction.

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