A proton with initial velocity: v$0=-(\mathrm{.}9$ x $10^6$ m$/$s$)$i hat $+(1\mathrm{.}2$ x $10^6$ m$/$s$)$j hat $-3\mathrm{.}6$ x $10^6$ m$/$s$)$ k hat, moves through a uniform magnetic field B$=(1\mathrm{.}25$ T$)$ k hat. a$)$ As viewed from above $($looking down at the xy$-$plane with the $+$z axis pointing out at you$),$ will the proton be deflected to the right or to the left of its straight line path? b$)$ calculate the magnitude of the force on the proton. c$)$ calculate the radius of the proton's resulting helical trajectory.