Explaining Why Gas Conducts Electric Fields

[Kajan thana]

Homework Statement

Explain why the gas becomes conducting only when the electric field in the tube reaches certain value?
2) why does fields does from higher potential to lower potential?

Homework Equations

F=QE

The Attempt at a Solution

If we increase the E then the Force will also increase so I think the gas needs certain amount of force for it to move to other end. I am not sure If I am right.

 

[DrClaude]

The problem statement is incomplete. What gas? What tube?

 

[Kajan thana]

A certain gas in a tube is subjected to an electric field of increasing strength. The gas becomes conducting when the electric field reaches a strength of 35NC^-1