A beam of electrons (of charge q. e nd mass m ) is shot into a region of uniform magnetic field with a speed of 50 m/s. "hey exit the region of uniform magnetic field opposite the direction they had ntered. How strong must the magnetic field be such that each electron stayed in the egion for a total of 10 ms? т e т e а. 0. 314- с. 314— m e m e b. 0. 628- d. 628-

A beam of electrons (of charge q. e nd mass m ) is shot into a region of uniform magnetic field with a speed of 50 m/s. "hey exit the region of uniform magnetic field opposite the direction they had ntered. How strong must the magnetic field be such that each electron stayed in the egion for a total of 10 ms? т e т e а. 0. 314- с. 314— m e m e b. 0. 628- d. 628-