1) In a sinusoidal electromagnetic wave in a vacuum, the electric field is given by  E=Emaxcos(ky+wt) i    ( w is omega)  This wave propagates in the negative y-direction.  Explain why.  2) In a sinusoidal electromagnetic wave in a vacuum, the electric field is given by E= Emax  cos(ky+wt)i  This magnetic field of this wave has only a z-component.  Explain why.

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