Science (086) — AI-generated practice question

A current-carrying solenoid produces a magnetic field pattern similar to that of a bar magnet. Inside the solenoid, field lines are parallel and straight, indicating a uniform magnetic field. Outside, the field lines emerge from one end, curve around, and re-enter the other end — just like a bar magnet.

One end of the solenoid behaves as the North pole (field lines emerge) and the other as the South pole (field lines enter). By observing which end the field lines come out of, we can identify the North pole, and the other end is automatically the South pole.

Source: Chapter 12, Section 12.2.4

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• Examiners expect three points: (1) field pattern description — parallel lines inside, bar-magnet-like outside; (2) the two ends act as N and S poles; (3) how to identify them via direction of field lines.
• Saying "uniform field inside" (parallel straight lines) is a key scoring point.
• You may sketch Fig. 12.10-style diagram instead of describing — a neat labelled diagram with arrows earns full credit.
• The comparison to a bar magnet is explicitly stated in the textbook and should be included.