With a transverse electromagnetic wave, the oscillating electric field, E$$E$,$ is perpendicular to the oscillating magnetic field, B$$B$.$ The wave velocity is parallel to the cross product E$$B$$E$$B$.$ The direction of the wave propagation may be determined by using the right$-$hand rule. Using the flattened right hand, the right$-$hand rule may be applied to a cross$-$product as follows:

c$=$a$$b$$where$$directionofa$(1$stinput$)=$thumbdirectionofb$(2$ndinput$)=$fingerspalmfacesdirectionofc$($output$)$c$=$a$$b$$where$\{$directionofa$(1$stinput$)=$thumbdirectionofb$(2$ndinput$)=$fingerspalmfacesdirectionofc$($output$)$