Define relaxation time of the free electrons drifting in a conductor: How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for the electrical resistivity of the material.
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Relaxation time is the time interval between two successive collisions of electrons in a conductor, when current flows.
n = no. of free electrons
a=area of conductor
e=charge of electron
v=(emE)TE= field m=mass of electron T= Relaxation time
From this, you can find expression of relaxation time
Field is LV L=Length and V=IR.
From this you can modify the expression in terms of resistivity.