Question

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

• A. ${\rho }_C>{\rho }_A>{\rho }_T$
• B. ${\rho }_M>{\rho }_A>{\rho }_C$
• C. ${\rho }_A>{\rho }_T>{\rho }_C$
• D. ${\rho }_A>{\rho }_M>{\rho }_C$

Answer 1

The correct option is B ${\rho }_M>{\rho }_A>{\rho }_C$

The resistivity of the given elements are as follows,

${\rho }_M=98\times {10}^{-8}\Omega \text{m}$
${\rho }_T=5.65\times {10}^{-8}\Omega \text{m}$
${\rho }_A=2.65\times {10}^{-8}\Omega \text{m}$
${\rho }_C=1.724\times {10}^{-8}\Omega \text{m}$

$\therefore {\rho }_M>{\rho }_T>{\rho }_A>{\rho }_C$

Hence, option $\left(B\right)$ is correct.