The dimensional formula of electric flux is . . . . . . .

$A$ hollow cylinder has a charge $q$ coulomb within it. If $\phi$ is the electric flux in units of volt-meter associated with the curved surface $B$,the flux linked with the plane surface $A$ in units of volt-meter will be:

Units of electric flux are

The number of electric lines that emerge from a finite charge $+q$ is . . . . . . .

When is electric flux said to be positive,negative,or zero?

If the total charge enclosed by a surface is zero,does it imply that the electric field everywhere on the surface is zero? Conversely,if the electric field everywhere on a surface is zero,does it imply that the net charge inside is zero?