alleryStart learning →Magnetic field lines can never cross one another. What does that rule guarantee about the field?
AIt falls to zero at every point
BIt points along the lines only
CIt has one value at every point
DIt has two values at every point
Answer & Solution
Correct answer: C. It has one value at every point
1. The field direction at a point is tangent to the field line through that point.
2. If two lines crossed, the tangent would give two different directions at the crossing.
3. Since field lines can never cross, the field is unique at any point in space.
4. A zero field is a separate situation and has nothing to do with crossing lines.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.3 Magnetic Fields and Magnetic Field Lines_
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