In a mass spectrometer, a beam of protons enters a magnetic field. Some protons make exactly a one-quarter circular arc of radius 0.60 .
A) If the field is always perpendicular to the proton's velocity, what is the field's magnitude if exiting protons have a kinetic energy of 12 ?
B) How long does it take the proton to complete the quarter circle?
C) Find the net force (magnitude) on a proton while it is in the field.