Lenz's Law and Induced Poles Steps:

• Assume north pole of magnet approaches end P, increasing flux through coil.
• Induced current creates north pole at P to repel approaching north pole, opposing flux increase.
• When north pole leaves end Q, flux through coil decreases.
• Induced current creates north pole at Q to attract receding north pole, opposing flux decrease.

Why A is correct:

• Lenz's law states induced emf opposes change in magnetic flux; north at P repels entry, north at Q attracts exit.

Why the others are wrong:

• B: South at P would attract entering north, violating opposition to flux increase.
• C: South at Q would repel leaving north, failing to oppose flux decrease.
• D: South poles at both ends contradict repulsion on entry and attraction on exit.

Final answer: A