Generated by claude-sonnet-4-6 · 2026-06-15 06:51 · grounding rag
Model Answer
(a) In figure 'a', the field lines emerge outward from the facing ends, indicating both P and Q are North poles.
In figure 'b', field lines emerge from R and merge into S, so R is North pole and S is South pole.
(b) The magnetic field lines emerge from the North pole and merge (enter) at the South pole outside the magnet. Inside the magnet, they travel from South pole to North pole. Thus, magnetic field lines are closed curves.
Source: Chapter 12, Section 12.1 – Magnetic Field and Field Lines
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Explanation
- Examiners look for correct pole identification based on direction of field lines (emerging = North, entering = South).
- In figure 'a', both inner ends repel field lines outward → both are North poles (like poles facing each other).
- The key inference the textbook states: field lines are closed curves — always mention this for inference-based questions.
- Part (a) carries 2 marks (½+½+1), so name all four poles clearly.