Question

Which of the following graph represents the variation of resistivity $\left(\rho \right)$ with absolute temperature $\left(T\right)$ for nichrome ?

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Since, the resistivity of a given material in terms of an absolute temperature is given as,

${\rho }_t={\rho }_0(1+\alpha \Delta T)$
i.e. the resistivity is directly proportional to the change in temperature.
Therefore, the required graph of resistivity Vs temperature for Nichrome is,