Resistivities of copper, silver and manganin are 1.7 \times 10^{-8} \mathrm{~m}, 1.0 \times 10^{-8} \mathrm{~m} and 44 \times 10^{-8} \mathrm{~m} respectively which of these is the best conductor?
Resistivities of copper, silver and manganin are 1.7 \times 10^{-8} \mathrm{~m}, 1.0 \times 10^{-8} \mathrm{~m} and 44 \times 10^{-8} \mathrm{~m} respectively which of these is the best conductor?

Ans: The resistance is directly proportional to specific resistance (resistivity), when length and area of cross-section is made constant. R=\frac{\rho I}{A}
Hence, silver is the best conductor as its specific resistance is less.