The resistance of a coil is $4.2\, \Omega$ at $100\,^o C$ and the temperature coefficient of resistance of its material is $ 0.004\,^o C$. Its resistance at $0\,^o C$ is ............. $\Omega$
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(c) $ {R_t} = {R_0}(1 + \alpha \,t)$
$ \Rightarrow $ $ 4.2 = {R_0}(1 + 0.004 \times 100) = 1.4{R_0} \Rightarrow {R_0} = 3\,\Omega $.
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