Question

Consider four conducting materials Copper, Tungsten, Mercury, and Aluminum with resistivity ${\rho }_c$, ${\rho }_m$ , ${\rho }_T$ and ${\rho }_A$ respectively. Then:

• A. ${\rho }_c>{\rho }_A>{\rho }_T$
• B. ${\rho }_{A>}{\rho }_{m>}{\rho }_c$
• C. ${\rho }_A>{\rho }_T>{\rho }_c$
• D. ${\rho }_m>{\rho }_A>{\rho }_c$

Answer 1

The correct option is D

${\rho }_m>{\rho }_A>{\rho }_c$

Definition of Resistivity

Resistivity is a property of a material that measures how strongly it resists the Electric current.

Comparing the Resistivity

The resistivity of copper, ${\rho }_c=1.72\times {10}^{-8}\Omega m$

The resistivity of Aluminum, ${\rho }_A=2.80\times {10}^{-8}\Omega m$

The resistivity of Tungsten, ${\rho }_T=5.65\times {10}^{-8}\Omega m$

The resistivity of Mercury, ${\rho }_m=98\times {10}^{-8}\Omega m$

By comparing these resistivity, we get

${\rho }_m>{\rho }_A>{\rho }_c$

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