$5$ In Module $28\mathrm{.}2,$ we discussed a charged particle moving through crossed fields with the forces F$$E and F$$B in opposition. We found that the particle moves in a straight line $($that is$,$ neither force dominates the motion$)$ if its speed is given by Eq$.28\mathrm{.}2\mathrm{.}2($ $=$ E$/$B$).$ Which of the two forces dominates if the speed of the particle is $($a$)$ $<$ E$/$B and $($b$)$ $>$ E$/$B$?$