Forces in uniform electric and gravitational fields

Steps:

• Uniform gravitational field exerts downward force on mass due to mg vector.
• Uniform electric field exerts force F = qE on charge; for negative q, force opposes field direction.
• Diagrams show field lines: gravitational downward, electric with arrow indicating direction.
• Correct row matches gravity force down and electric force opposite to field arrow.

Why B is correct:

• B aligns with F = qE law (negative q reverses direction) and gravitational force mg (always toward Earth).

Why the others are wrong:

• A: Shows electric force same direction as field, ignoring negative charge sign.
• C: Depicts gravitational force upward, violating downward attraction to Earth.
• D: Reverses both forces, contradicting field conventions.

Final answer: B