Compass aligns with magnetic field lines from bar magnet

Steps:

• Identify the bar magnet's north (N) and south (S) poles; field lines emerge from N and enter S.
• Place the plotting compass near the magnet; its needle acts like a mini bar magnet with its own N and S.
• The compass N pole is repelled by the magnet's N and attracted to its S, aligning with local field direction.
• Select the diagram showing the needle pointing along the field line at that position.

Why A is correct:

• Compass needle aligns parallel to the magnetic field line exiting the N pole, per the rule that unlike poles attract and like poles repel.

Why the others are wrong:

• B shows needle pointing opposite to field lines, ignoring attraction/repulsion.
• C depicts perpendicular alignment, which violates field line tangency.
• D illustrates inward pointing near N pole, contradicting outward field from N.

Final answer: A