An electromagnetic wave in vacuum has the electric and magnetic field `vecE` and `vecB`, which are always perpendicular to each other. The direction of polarization is given by `vecX` and that of wave propagation by `vecK`. Then

Options

A. `vecX || vecE and vecK || vecE xx vecB `
B. `vecX || vecB and vecK || vecE xx vecB `
C. `vecX || vecE and vecK || vecB xx vecE `
D. `vecX || vecB and vecK || vecB xx vecE `

Answer

A

Explanation

The direction of polarization is parallel to electric field
`therefore vecX || Vec E`
The direction of the propagation of the wave is parallel to ` vecE xx vecB `
` therefore vecK || vecE xx vecB`