Electromagnetic waves: An electromagnetic wave is propagating towards the west. At a certain moment the direction of the magnetic field vector associated with this wave points vertically up. The direction of the electric field vector of this wave is
A) horizontal and pointing south.
B) vertical and pointing down.
C) horizontal and pointing north.
D) vertical and pointing up.
E) horizontal and pointing east.

Question

Quizplus · Accepted Answer

Electromagnetic waves follow the right-hand rule, where the thumb points in the direction of propagation, the fingers point in the direction of the electric field, and the palm faces in the direction of the magnetic field. If the wave is moving west and the magnetic field is up, the electric field must be pointing south.

Electromagnetic Waves: an Electromagnetic Wave Is Propagating Towards the West