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Q.
Which of these is a true graph showing a relation between resistivity $\rho$ and temperature for semiconductor?
Semiconductor Electronics: Materials Devices and Simple Circuits
Solution:
For a semiconductor, conductivity increases with temperature or more electron-hole pairs are created due to thermal agitation.
So, $\rho \propto \frac{1}{T}$
$ \Rightarrow \sigma \propto T $
$\Rightarrow \frac{1}{\rho} \propto T$