The aquadag coating on the inside of PPI tube is used
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:A
The aquadag coating on the inside of PPI tube is used
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