For example , if the electric field vector is vertical ( alternately up and down as the wave travels ) the radiation is said to be vertically polarized .
The orientation of a linearly polarized electromagnetic wave is defined by the direction of the electric field vector .
If the electric field vector is vertical ( alternately up and down as the wave travels ) the radiation is said to be vertically polarized .
The orientation of a linearly polarized electromagnetic wave is defined by the direction of the electric field vector .