alleryStart learning →Why is a small compass a fair instrument for mapping a magnetic field?
AIt converts the field into a current
BIt does not disturb the field it tests
CIt doubles the field that it is testing
DIt cancels the field that it is testing
Answer & Solution
Correct answer: B. It does not disturb the field it tests
1. A probe is only useful if reading the field does not change the field.
2. Small compasses used to test a magnetic field will not disturb it.
3. This mirrors the use of a small test charge to map an electric field.
4. In both cases the field map represents the object creating the field and not the probe.
_Source: OpenStax College Physics (CC BY 4.0), Ch 22 "Magnetism", section 22.3 Magnetic Fields and Magnetic Field Lines_
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