Electric field lines reveal charge sign and magnitude

Steps:

• Field lines point away from positive charges and toward negative charges.
• For opposite charges, lines start at the positive and end at the negative.
• Line density increases near the charge with greater magnitude.
• Diagram shows lines originating densely from P toward sparser Q, indicating P positive and larger.

Why D is correct:

• Lines originate from P (positive) and are denser there, confirming greater magnitude per field line density rule.

Why the others are wrong:

• A: Lines from P mean P positive, not negative.
• B: Denser lines at P mean greater, not smaller, charge.
• C: Lines toward Q mean Q negative, but P positive with greater magnitude.

Final answer: D