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Question

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, ρ=RAl
  • Where ρis known as rho signifying the resistivity, R is known as the resistance of the material, A is the cross-sectional area, and l denotes the length of the wire.

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