If the magnetic field of an electromagnetic wave is vibrating up and down and the wave is directed north, what is the direction of the vibrations of the electric field?
A. Up and down
B. Along an east-west line
C. Straight up to the sky
D. Along a north-south line
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Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.
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