8-12B5 C
A negative voltage is commonly applied to the magnetron cathode rather than a positive voltage to the magnetron anode because:
A. The cathode must be made neutral to force electrons into the drift area.
B. A positive voltage would tend to nullify or weaken the magnetic field.
C. The anode can be operated at ground potential for safety reasons.
D. The cavities might not be shock-excited into oscillation by a positive voltage.
