A magnetron differs from a conventional diode tube in that it uses a
permanent magnet to deflect the electron beam and its plate is at
ground potential. The reason for grounding the plate is to
prevent shock hazards.
reduce magnetron pushing.
permit the use of a conventional filament transformer for the
The combination of the electric and magnetic fields causes the
electrons to take a twisting spiraling motion toward the anode.
magnetron that has the greatest magnetic field strength is represented
in Figure 103 in the sketch labeled