Which statement is NOT a property of magnetic lines of force?
AThey are continuous and form closed loops
BThey start at the North and end at the South Pole
CThey pass through magnetic materials only
DThey never cross or intersect one another
Answer & Solution
Correct answer: C. They pass through magnetic materials only
1. Magnetic lines of force are continuous closed curves.
2. Outside the magnet they run from the North Pole to the South Pole.
3. They never intersect, because a single point cannot have two field directions.
4. They crowd together near the poles, which is where the field is strongest, and meet a magnetic surface at right angles.
5. But they pass through all materials, not magnetic ones alone — they run through air and through a vacuum — so that is the false statement.
_Source: NECTA CSEE 2021 Physics 031, Question 1: Multiple Choice, item (iii)_
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