Question 11. Figure shows an electron gun that emits electrons at very small angel with axis. The paraxial electrons emitted from the cathode (filament) are refocused at a distance s after accelerating through a potential difference V, s is given by (Take π 2 = 10) :-
(a) s = 2 20 m V e B 2
(b) s = 20 m V e B 2
(c) s = 10 m V e B 2
(d) None of these

 

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