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Define resistivity of a material and discuss the factors on which it depends. |
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Answer» Solution :Resistivity (SPECIFIC resistance `rho`) of the MATERIAL of a conductor is defined as the resistance of unit length and unit area of cross-section of the conductor. And `rho=(m)/(n e^(2)tau)` Thus resistivity of the material of a conductor depends upon (i) `rhoprop(1)/(n)` i.e., resistivity is INVERSELY proportional to the NUMBER density of electrons (number of electrons per unit VOLUME) inside the conductor. (ii) `rhoprop(1)/(tau)` i.e. resistivity is inversely proportional to the average relaxation time of the free electrons in the conductor. The value of n depends upon the nature of conductor and `tau` depends upon the temperature of the conductor. |
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