Two long concentric  cylindrical conductors of radii a and b `(b lt a)` are maintained at a
Channel: Doubtnut
Date: 2020-08-30

Two long concentric  cylindrical conductors of radii a and b `(b lt a)` are maintained at a potential difference V and carry equal opposite current I. Show that an electron with a particular velocity u parallel to the axis may travel undeviated in the evacuated region between the conductors.