An electromagnetic wave is traveling straight down toward the center of the Earth. At a certain moment in time the electric field points west.
In which direction does the magnetic field point at this moment?

(a) North.
(b) South.
(c) East.
(e) West.
(d) Up.
(f) Down.
(g) Either (a) or (b).
(h) Either (c) or (d).
(i) Either (e) or (f).

Question

An electromagnetic wave is traveling straight down toward the center of the Earth. At a certain moment in time the electric field points west.
In which direction does the magnetic field point at this moment?

	(a) North.
	(b) South.
	(c) East.
	(e) West.
	(d) Up.
	(f) Down.
	(g) Either (a) or (b).
	(h) Either (c) or (d).
	(i) Either (e) or (f).

anonymous · Answer

G i am going with. relativistic effects and ions in the atmosphere could cause a polarization so that no light or an actual change in your answer, would be different.