In an electromagnetic wave,1)how are the electric and magnetic field directions related and 2)how is the direction of travel determined from their directions? (

\overrightarrow { \mathbf { c } }

is the velocity of the light wave. )
A)

\overrightarrow { \mathbf { E } } \| \overrightarrow { \mathbf { B } } ; \frac { \overrightarrow { \mathbf { c } } } { c } = \frac { \overrightarrow { \mathbf { E } } \times \overrightarrow { \mathbf { B } } } { | \overrightarrow { \mathbf { E } } \times \overrightarrow { \mathbf { B } } | }

.
B)

\overrightarrow { \mathbf { E } } \| \overrightarrow { \mathbf { B } } ; \frac { \overrightarrow { \mathbf { c } } } { c } = \frac { \overrightarrow { \mathbf { B } } \times \overrightarrow { \mathbf { E } } } { | \overrightarrow { \mathbf { B } } \times \overrightarrow { \mathbf { E } } | }

.
C)

\overrightarrow { \mathbf { E } } \perp \overrightarrow { \mathbf { B } } ; \frac { \overrightarrow { \mathbf { c } } } { c } = \frac { \overrightarrow { \mathbf { E } } \times \overrightarrow { \mathbf { B } } } { | \overrightarrow { \mathbf { E } } \times \overrightarrow { \mathbf { B } } | }

.
D)

\overrightarrow { \mathbf { E } } \perp \overrightarrow { \mathbf { B } } ; \frac { \overrightarrow { \mathbf { c } } } { c } = \frac { \overrightarrow { \mathbf { B } } \times \overrightarrow { \mathbf { E } } } { | \overrightarrow { \mathbf { B } } \times \overrightarrow { \mathbf { E } } | }

.
E)

\overrightarrow { \mathbf { E } } = \overrightarrow { \mathbf { B } } / c ; \frac { \overrightarrow { \mathbf { c } } } { c } = \frac { \overrightarrow { \mathbf { B } } \overrightarrow { \times } \mathbf { E } } { | \overrightarrow { \mathbf { B } } \times \overrightarrow { \mathbf { E } } | }

The Magnetic Field of a Plane-Polarized Electromagnetic Wave Moving in the Z-Direction

Multiple Choice

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