If the resistance of a conductor is $5\,\Omega\,\,$ at $\,50\,^oC$ and $7\, \Omega\,$ at $\,100\,^oC$ then the mean temperature coefficient of resistance of the material is ............... $^oC$
Medium
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Using ${R_{{T_2}}} = {R_{{T_1}}}[1 + \alpha ({T_2} - {T_1})]$
$ \Rightarrow $ ${R_{100}} = {R_{50}}[1 + \alpha (100 - 50)]$
$ \Rightarrow $ $7 = 5\,[1 + (\alpha \times 50)]$ $ \Rightarrow $ $ \propto \, = \,\frac{{(7 - 5)}}{{250}} = 0.008\,{^o}C$
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