The aquadag coating on the inside of PPI tube is used Options: A . &nbspTo focus the beam of primary electrons B . &nbspTo shield the electron beam from unidirectional magnetic C . &nbspAs a second anode and to prevent the build-up of secondary field D . &nbspAll of these

The aquadag coating on the inside of PPI tube is used

Question

The aquadag coating on the inside of PPI tube is used

Options:

A . To focus the beam of primary electrons

B . To shield the electron beam from unidirectional magnetic

C . As a second anode and to prevent the build-up of secondary field

D . All of these

Answer: Option C

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