Science (086) — AI-generated practice question

(a) Bar Magnet – Magnetic Field Lines:

```
N ——→—— S
(Field lines emerge from N, curve around, and enter S)
```

(Labelled diagram showing closed curved lines emerging from North pole, curving around outside, entering South pole, and continuing inside from S to N.)

(b) Current-carrying Circular Loop – Magnetic Field Lines:

(Labelled diagram showing concentric arcs around the wire that straighten into parallel straight lines at the centre of the loop, with the direction determined by the right-hand thumb rule.)

Similarity: In both cases, the magnetic field lines form closed loops — they have no starting or ending point.

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• Examiners expect two separate labelled diagrams — even rough sketches with labels (N, S; direction arrows; current direction I) earn full credit.
• The key similarity tested here is that field lines are always closed and continuous in both patterns (a property of all magnetic fields).
• For the circular loop, mention that field lines appear as straight parallel lines at the centre — this is a commonly tested detail from §12.2.3.
• Do not confuse similarity with the solenoid; the question asks only about the circular loop.

Source: Chapter 12, §12.2 and §12.2.3