Question

Q20. Define resistivity of the material of a wire. State its S.I. unit.

Answer 1

HEY ANSWER IS........!!

The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The unit for resistivity is the ohm-metre. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.

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Answer 2

Resistivity is a property of a wire which depends only on nature of conductor.
On changing configuration resistance will change.
SI unit is Ohm metre