The variation of resistivity of a metallic conductor with temperature is given correctly by which of the following relations?
(Where $ρ_T$ is the resistivity at a temperature T and $ρ_0$ is the resistivity at a reference temperature $T_0$. $α$ is the temperature coefficient of resistivity. $T> T_0$)
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → $ρ_T=ρ_0[1 + α(T-T_0)]$
The correct relation is:
$\rho_T = \rho_0 \big[1 + \alpha (T - T_0)\big]$
where
$\rho_T =$ resistivity at temperature $T$
$\rho_0 =$ resistivity at reference temperature $T_0$
$\alpha =$ temperature coefficient of resistivity