Question

Which statement correctly describes the resistivity of a wire?
Resistivity depends on the material the wire is made from and has units of ohm-meters.
Resistivity depends on the current through the wire and has units of ohm-meters.
Resistivity depends on the current through the wire and has units of ohms.

Resistivity depends on the material the wire is made from and has units of ohms.

Answer 1

Answer:

Resistivity depends on the material the wire is made from and has units of ohm-meters.

Explanation:

Answer 2

This question involves the concepts of resistivity, cross-sectional area, and resistance.

The statement which correctly describes the resistivity of a wire is, "Resistivity depends on the material the wire is made from and has units of ohm-meters".

The resistivity of a material is defined as the resistance per unit length per unit cross-sectional area of a material. It is found experimentally that the resistance of a conductor is directly proportional to its length ‘L’ and inversely proportional to its cross-sectional area ‘A’.

$R\ \ \alpha\ \ \frac{L}{A}\\\\R=\rho\frac{L}{A}$

where ρ is a constant called ‘Resistivity’.

The S.I unit of resistivity is clear from the equation, which is equal to:

$\Omega=\rho\frac{m}{m^2}\\\\\rho = \Omega.m$

So, the S.I unit of resistivity is Ohm-meters.

Learn more about resistivity here:

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