What indicates a uniform electric field between two charged parallel plates?

• A. Field lines are more closely spaced at the positive electrode.
• B. Field lines intersect halfway between the electrodes.
• C. Field lines are more closely spaced at the negative electrode.
• D. Field lines are equally spaced at both electrodes.

Answer: (D)

A uniform electric field between two charged parallel plates is indicated by equally spaced electric field lines. In a uniform electric field, the strength and direction of the field remain constant throughout the region between the plates. This is reflected by field lines that are parallel and equally spaced, demonstrating that the magnitude of the electric field is the same at various points in the space between the plates.

When the field lines are equally spaced, it signifies that the force experienced by a charged particle would be constant regardless of its position between the plates, aligning with the definition of a uniform electric field. If the lines were denser at one electrode or if they intersected, it would indicate varying field strengths and directions, thereby implying a non-uniform field. Thus, the correct indication of a uniform electric field is the condition where the field lines are spaced evenly throughout the area between the electrodes.