The resistance of platinum wire at $0^{\circ} \mathrm{C}$ is $2 ~\Omega$ and $6.8 ~\Omega$ at $80^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is :

Question

$3 \times 10^{-3} \mathrm{C}^{-1}$

$3 \times 10^{-2} \mathrm{C}^{-1}$

$3 \times 10^{-10} \mathrm{C}^{-1}$

$3 \times 10^{-4} \mathrm{C}^{-1}$

Solution

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