In metals the major factor affecting the value of resistivity when temperature changes is
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Solution
Resistivity:
Resistivity is the fundamental property of a metal that helps to determine how strongly the metal opposes the flow of current.
Resistivity of a metal does not change many metals when temperature increases, but the value of τ decreases causing resistivity to increase.
Hence, the resistivity of metal does depend on temperature as metal is a conductor and is inversely proportional to temperature.
Resistivity is expressed as the following equation,
Where is known as rho signifying the resistivity, is known as the resistance of the material, is the cross-sectional area, and denotes the length of the wire.