Thanks arpon, but still your case is explaining when the current flow is vertical, I would like to know when the flow is turning to the right side. In other words, the two electrodes are on the bottom and the right side.
As you know, resistance of a rectangular shape is given by R=ρ A/L
But how do we theoretically calculate the resistance of the bottom case? ( now, the current flow is not parrallel, current flows from bottom through the right side)
I would like to know if there is any references for this...