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                                    An electromagnetic wave in vacuum has the electric and magnetic field →E and →B, which are always perpendicular to each other. The direction of polarization is given by →X and that of wave propagation by →k. Then | 
                            
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Answer»  An electromagnetic wave in vacuum has the electric and magnetic field →E and →B, which are always perpendicular to each other. The direction of polarization is given by →X and that of wave propagation by →k. Then  | 
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