alleryStart learning →Which statement about the resistivity of a substance is correct?
AIt depends on the object's length
BIt depends on the object's area
CIt is measured in ohms per ampere
DIt is independent of shape and size
Answer & Solution
Correct answer: D. It is independent of shape and size
1. Resistance R belongs to a particular object and changes if you cut or stretch it.
2. Resistivity rho belongs to the material itself and is an intrinsic property.
3. It stays the same whatever shape or size the sample is cut to.
4. Shape enters only through R = rho L / A, where L and A describe the object rather than the material.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section 20.3 Resistance and Resistivity_
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