The electric and the magnetic field associated with an E.M.

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The electric and the magnetic field associated with an E.M. wave, propagating along the +z-axis, can be represented by

Correct Option: A

E.M. wave always propagates in a direction perpendicular to both electric and magnetic fields. So, electric and magnetic fields should be along + X– and + Y–directions respectively. Therefore, option (a) is the correct option.