Homework Answers
Here from the equation we can see the wave propagates in postitive X direction.
Electromagnetic wave propagation direction is perpendicular to
both electric field and magnetic field direction. So both electric
field and magnetic field will be in Y-Z plane and E 
B gives the propagation direction positive X direction.
So, magnetic field will be in Z direction and electric field will be in Y direction to make the propagation direction positive X direction.
Ans: Magnetic field will be in Z direction.
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