Define the electric resistivity of a conductor.
Plot a graph showing the variation of resistivity with temperature in the case of a (a) conductor, (b) semiconductor.
Briefly, explain, how the difference in the behaviour of the two can be explained in terms of number density of charge carriers and relaxation time.
Plot a graph showing the variation of resistivity with temperature in the case of a (a) conductor, (b) semiconductor.
Briefly, explain, how the difference in the behaviour of the two can be explained in terms of number density of charge carriers and relaxation time.
CBSE OUTSIDE DELHI - SET 1 BHUBNESHWAR 2015
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Resistivity of a conductor is defined as the resistance of a material (of a Conductor) of unit length and unit area of cross section.
Alternate Answer
In conductor with increase in temperatures, relaxation time decreases, but number density of charge carriers is not dependent on temperature. Hence,$\rho$ increases.
In semiconductors number density of charge carriers increases with temperature, it dominates the decrease in relaxation time. Hence, $\rho$ decreases.
Alternate Answer
In conductor with increase in temperatures, relaxation time decreases, but number density of charge carriers is not dependent on temperature. Hence,$\rho$ increases.
In semiconductors number density of charge carriers increases with temperature, it dominates the decrease in relaxation time. Hence, $\rho$ decreases.
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