Consider four conducting materials copper, tungsten, mercury and aluminum with resistivity ρC , ρT , ρM and ρA

Question

Consider four conducting materials copper, tungsten, mercury and aluminum with resistivity $\rho$_C , $\rho$_T , $\rho$_M and $\rho$_A respectively. Then : 

(1) $\rho$_C > $\rho$_A > $\rho$_T

(2) $\rho$_A > $\rho$_T > $\rho$_C

(3) $\rho$_A > $\rho$_M > $\rho$_C

(4) $\rho$_M > $\rho$_A > $\rho$_C

Answer 1

Ans. (4) $\rho$_M > $\rho$_A > $\rho$_C

Sol. $\rho$_M = 98 × 10^–8

$\rho$_A = 2.65 × 10^–8

$\rho$_C = 1.724 × 10^–8

$\rho$_T = 5.65 × 10^–8

Answer 2

Option (D) is the correct answer.

Values are given in NCERT and that has to be remembered.