What is the purpose of the electromagnetic field which surrounds a tr – McqOptions

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1.	What is the purpose of the electromagnetic field which surrounds a traveling-wave tube?
A.	To accelerate the electron
B.	To velocity modulate the electron beam
C.	To keep the electrons from spreading out
D.	To slow down the signal on the helix
Answer» D. To slow down the signal on the helix

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