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

The direction of the electric field vector in an electromagnetic wave is perpendicular to both the magnetic field vector and the direction of propagation. Given the magnetic field points up and the wave propagates west, using the right-hand rule, the electric field points south.

An Electromagnetic Wave Is Propagating Towards the West