Question
Download Solution PDFThe resistivity of a metal is a function of temperature because
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Mobility (μ): It is defined as the ratio of Drift velocity to the Electric field.
It also describes how fast is the charge carrier moving from one place to another.
Electron mobility is greater than hole mobility.
Explanation:
As temperature increases, the atoms in the material will vibrate and due to these thermal vibrations, the mobility of the charge carrier reduces.
As
where,
m = 2.5 for electron
m = 2.7 for holes in case of silicon
Hence electrical conductivity of metal has a negative temperature coefficient.
So as temperature increases,
Mobility decreases due to which collision of electrons increases with an increase in temperature.
Last updated on Jul 2, 2025
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