A charged particle travels along a straight line with a speed $v$ in a region where both electric field $E$ and magnetic field $B$ are present. It follows that $\left(v\perp B\right)$

$\left|E\right|=v\left|B\right|$ and the two fields are perpendicular 

$\left|B\right|=v\left|E\right|$ and the two fields are parallel

$\left|B\right|=v\left|E\right|$ and the two fields are perpendicular 

$\left|E\right|=\left|B\right|$ and the two fields are perpendicular