alleryMagnetic field lines:
AStart and end at the same pole
BAre open loops always
CForm closed loops (outside, N to S; inside magnet, S to N)
DAlways cross each other
Answer & Solution
Correct answer: C. Form closed loops (outside, N to S; inside magnet, S to N)
1. Magnetic field lines form CLOSED loops — they have no beginnings or ends.
2. Outside a magnet they go from N to S; inside they go from S to N.
3. They never cross — if they did, two directions of B would exist at the crossing point, which is impossible.
_Source: syllabus Science Ch 12 §12.1.1 Magnetic Field Lines_
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