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A beam of electrons (of charge qe and mass m ) is shot into a region of uniform magnetic field
with a speed of 50m/s. They exit the region of uniform magnetic field opposite the direction
they had entered. How strong must the magnetic field be such that each electron stayed in the
region for a total of 10 ms?
m
m
a. 0.314–
c. 314
m
m
b. 0.628
–
d. 628-
9.

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