The resistivity of an iron wire is $10 \times 10^{-8} \Omega m$. The resistance of an iron wire is $5 \Omega$. If its length as well as thickness is doubled then its resistivity will be:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $10 \times 10^{-8} \Omega m$
Resistivity (denoted by ρ) is property of material that quantifies how strongly it resists the flow of electric currents.
It is independent of the shape or size of the material and is a fundamental property of itself.