Use the data in Table `3.1` to answer the following :
(a) Which among iron and mercury is a better conductor ?
(b) Which material is the best conductor ?

Explanation

(a) Resistivity of iron `= 10.0xx10^(-8)Omega`
Resistivity of mercury `=94.0xx10^(-8)Omega`
Resistivity of mercury is more than that of iron. This implies that iron is a better conductor than mercury.
(b) It can observed form Table 12.2 that the resistivity of silver is the lowest among the listed materials. Hence, it is best conductor.