An Electromagnetic Wave Is Propagating Towards the West in a Vacuum.At

An electromagnetic wave is propagating towards the west in a vacuum.At a certain moment the direction of the $\vec { B }$ field vector associated with this wave points vertically upward.What is the direction of the $\vec { E }$ field vector?

A) horizontal and pointing south
B) vertical and pointing down
C) horizontal and pointing north
D) vertical and pointing upward
E) horizontal and pointing east

Correct Answer:

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