Final answer:
The electric field lines are equally spaced at both electrodes between them, indicating a constant field strength.
Step-by-step explanation:
The concept of a uniform electric field between two electrodes means that the electric field lines are equally spaced at both electrodes between them. In this case, the spacing of the electric field lines is the same throughout the region between the electrodes, indicating a constant electric field strength.
This uniformity of the electric field is achieved when the excess charges on the electrodes distribute themselves uniformly, resulting in field lines that are uniformly spaced and perpendicular to the surfaces of the electrodes. Note that near the edges of the plates, there may be deviations from uniformity.