Consider a cylindrical tube closed at one end and fitted with a conducting, movable piston at the
Channel: Doubtnut
Date: 2020-07-12

Consider a cylindrical tube closed at one end and fitted with a conducting, movable piston at the other end. A cathode is fixed in the tube near the closed end and an anode is fixed with the piston. A gas is filled in the tube at pressure `p`. Using Paschen equation `V = f(pd), show that the sparking potential does not change as the piston is slowly moved in or out. Assume that the temperature does not change in the process.