Question

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

• A. $\frac{R_0}{m}$
• B. $mR_0$
• C. $m^2 R_0$
• D. $\frac{m}{R_0}$

Answer 1

Answer: (D)

$\frac{m}{R_0}$

Answer 2

$R_{t}=R_{0}(1+\alpha \Delta t)$
where, $\alpha$ is temperature coefficient of conductor
$=R_{0}+R_{0} \alpha \Delta T$
Slope of graph
$m=R_{0} \alpha$
$\therefore \alpha=\frac{m}{R_{0}}$