If the magnetic field in a plane electromagnetic wave is along the y axis and its magnitude is given by B_m sin (kx - **t)in SI units, then the electric field is along the z axis and its magnitude is given by A)(cB_m)cos (kx - *t) B)-(cB_m)cos (kx - *t) C)(cB_m)sin (kx - *t) D)-(cB_m)sin (kx - t) E)B_mcos (kx - t)

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Quizplus · Accepted Answer

The electric field (E) and magnetic field (B) in an electromagnetic wave are perpendicular to each other and to the direction of propagation. The magnitude of the electric field is given by E = cB, where c is the speed of light. Since the magnetic field is given as B sin(kx - ωt), the electric field will have the same phase and be given by E = cB sin(kx - ωt), aligning with choice C.

If the Magnetic Field in a Plane Electromagnetic Wave Is