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The conductivity of a metal decreases with the increase in temperature on account of 
Option: 1 decrease in number density of electrons. 
Option: 2 decrease in resistivity. 
Option: 3 decrease in relaxation time. 
Option: 4 increase in mean free path.

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The conductivity of a metal decreases with the increase in temperature on account of decrease in relaxation time. 

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Safeer PP

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