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Define resistivity of a material and dis...

Define resistivity of a material and discuss the factors on which it depends.

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Resistivity : The resistance of unit cube of a substance is known as its. resistivity. The resistivity of a conductor depends upon the following factors :
1. It is inversely proportional to the number of electrons per unit volume (number density) of a substance.
2. It is inversely proportional to the relaxation time of free electrons inside the conductor.
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