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

Answer

C

Explanation

Polarisation is directly propartional to the electric field ` vecX || vecE` The direction of propagation of wave is perpendicular to cross prodcut of ` vecE and vecB `
` vecK = ( vecE xx vecB)/(|vecE xx vecB|)`