A proton is traveling through a magnetic field that points into the screen. Its velocity when it enters the field and its radius of curvature is The proton is traveling in a completely vertical direction from the bottom of the screen to the top of the screen. (Mass of a proton: , charge of a proton: ).
(9) Find the magnitude of the electric field.
Since the proton is traveling in a direction perpendicular to the magnetic field, the motion of the proton and the behavior of the field are governed by
