Electric field direction for negative source charge

Steps:

• Negatively charged test charge at P experiences repulsion from X, so X must be negatively charged (like charges repel).
• Electric field due to negative charge X points towards X at any point P.
• Force on negative test charge is opposite the electric field direction, confirming repulsion away from X aligns with field towards X.
• Diagram positions imply towards X is rightward (→).

Why C is correct:

• Arrow C (→) points towards X, matching the field direction for a negative source charge by convention.

Why the others are wrong:

• A (←) points away from X, opposite the field for negative X.
• B (↑) is perpendicular to the radial field line.
• D (↓) is perpendicular to the radial field line.

Final answer: C