A charged particle travels along a straight line with a speed v in a region where both electric field E and magnetic field B ae present.It follows that
|E|=|B| and the two fields are perpendicular.
|E|=v|B| and the two fields are perpendicular.
|B|=v|E| and the two fields are parellel
|B|=v|E| and the two fields are perpendicular.
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