The resistance R of a conductor varies with temperature as shown in Fig. 4.57. If it is written as : ${\mathrm{R}}_1={\mathrm{R}}_0\left(1+\mathrm{\alpha t}+{\mathrm{\beta t}}^2\right)$

• A

  $\mathrm{\alpha } \mathrm{and} \mathrm{\beta }$ are both negative

• B

  $\mathrm{\alpha }$ is positive but $\mathrm{\beta }$ is negative

• C

  $\mathrm{\alpha } \mathrm{and} \mathrm{\beta }$ are both positive

• D

  $\mathrm{\alpha }$ is negative but $\mathrm{\beta }$ is positive