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An electromagnetic wave in vacuum has th...

An electromagnetic wave in vacuum has the electric and magnetic field `vec E` and `vec B` which are always perpendicular to each other. The direction of polarisation is given by `vec X` and that of wave propagation by `vec k` then

A

`vecX||vecB` and `veck || vecBxxvecE`

B

`vecX||vecE` and `veck || vecExxvecB`

C

`vecX||vecB` and `veck || vecExxvecB`

D

`vecX||vecE` and `veck || vecBxxvecE`

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