more discussion with teacher

Can we have a centre line joining the +ve and -ve charges?

Centre field line is drawn for +- case but missing in ++ or Ė cases.
I donít understand why 3 more lines (first picture), I only understand the centre line (2nd picture).
The current field lines are drawn starting at equal distance around the circumference of the charge (scientifically accurate), so to get more lines, select a higher number of lines to draw.[/b][/color]