27.22 . In an experiment with
cosmic rays, a vertical beam of particles
that have charge of magnitude
and mass 12 times the proton
mass enters a uniform horizontal
magnetic field of 0.250 T and is
bent in a semicircle of diameter
95.0 cm, as shown in Fig. E27.22.
(a) Find the speed of the particles
and the sign of their charge. (b) Is
it reasonable to ignore the gravity force on the particles? (c) How
does the speed of the particles as they enter the field compare to
their speed as they exit the field?