Hela proton having an initial velvocity of 20.0i mm/s enters a
the swiform magnetic field of magnitude 0.300 t with a direc-
si in perpendicular to the proton's velocity. it leaves the
this field-filled region with velocity -20.0j mm/s. determine
ed (a) the direction of the magnetic field, (b) the radius of
curvature of the proton's path while in the field, (c) the
distance the proton traveled in the field, and (d) the time
interval during which the proton is in the field.