Variation of resistance of the conductor with temperature is as shown
The temperature co-efficient $(α)$ of the conductor is

\frac{R_{o}}{m}

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m R_{o}

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m^{2} R_{o}

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\frac{m}{R_{o}}

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Solution

The correct option is C $\frac{m}{R_{o}}$
Resistance of conductor, $R = R_{o} (1 + α Δ T)$ where $Δ T = T - T_{o}$
$⟹$ $R = R_{o} + R_{o} α Δ T$
We get slope of line, $m = R_{o} α$
$⟹$ Temperature co-efficient, $α = \frac{m}{R_{o}}$

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