Question: Now the electric field in the previous problem is turned off and a uniform magnetic field is made to fill the space between the plates. The direction of B, the magnetic field, is out of the plane of Fig.
a. In what direction will the electrons be deflected?
b. For what value of B will the magnitude of the change in momentum of the electrons passing between the plates be the same as that produced by the electric field of the previous problem?
Fig. - A beam of electron passes (a) through an electric field and then, (b) through an magnetic field