Uniform Electric Field

Steps:

• Parallel, evenly spaced field lines indicate a uniform electric field with constant strength E.
• Electric force on charge P is F = qE, where q is constant.
• In a uniform field, E remains the same at all nearby positions.
• Thus, small displacements in any direction keep F unchanged.

Why A is correct:

• Uniform fields exert constant force F = qE everywhere, per Coulomb's law.

Why the others are wrong:

• B: Direction Y keeps E constant, so force unchanged.
• C: Direction Z keeps E constant, so force unchanged.
• D: Direction X keeps E constant, so force unchanged.

Final answer: A