Generated by claude-sonnet-4-6 · 2026-06-15 06:51 · grounding rag
Model Answer
(i) Magnetic field line patterns:
Solenoid: Field lines inside are parallel and straight (uniform field); outside they emerge from one end and re-enter the other, similar to a bar magnet pattern.
Bar Magnet: Field lines emerge from the North pole, curve around, and enter the South pole; inside the magnet, lines run from South to North. All lines are closed curves.
(Diagrams should show these patterns with arrows indicating direction.)
(ii) Two distinguishing features:
- The magnetic field of a solenoid is produced by electric current and can be switched on/off, whereas a bar magnet's field is permanent and always present.
- The strength of a solenoid's field can be varied by changing the current, but the bar magnet's field strength cannot be easily changed.
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Explanation
- Examiners expect recognisable labelled diagrams for (i) — draw clearly with arrows showing field direction (N→S outside, S→N inside).
- For distinguishing features, focus on origin of field (current vs. permanent magnetism) and controllability — these are the most scoring points.
- Both diagrams carry ~1 mark together; the two features carry 1 mark each. Keep the answer concise.