a Derive an expression for the resistivity of a material in terms of relaxation time number density and mass and charge of

Question

a Derive an expression for the resistivity of a material in terms of relaxation time number density and mass and charge of charge carriers in it Explain using this relation why the resistivity of the metal increases and that of a semiconductor decreases with rise in temperature b Draw a Graph showing variation of resistivity with temperature for nichrome Which property of nichrome is used to make standard resistance coils

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