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

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

B . To shield the electron beam from unidirectional magnetic

C . All of these

D . To focus the beam of primary electrons

Answer: Option A

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