Grade 12Electric Current
Derive an expression for conductivity of a material in terms of relaxation time
Derive an expression for conductivity of a material in terms of relaxation time
1 Answer
usha
Conductivity(
):- the reciprocal of resistivity of the material of the conductor is conductivity.
):- the reciprocal of resistivity of the material of the conductor is conductivity.Resistivity(
):- consider a wire of length l and area of cross section A. the drift velocity of electron is
):- consider a wire of length l and area of cross section A. the drift velocity of electron isVd = 
……(1)
……(1)But, vd = 
……(2)
……(2)Comparing these 2 equations:-
bcz V= El
But 
But also, 
Comparing these 2 equation, 
Now we know that
Conductivity is 
vd
Bcz, 
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