Use the data in Table 12.2 to answer the following –
(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?
Lower the value of resistivity lower will be the resistance for a material of given area and length. If resistance is law current flow will be high when a potential difference is applied across the conductor.
(a).resistivity of iron =
the resistivity of mercury =
the resistivity of mercury is more than iron so iron is a better conductor than mercury.
(b).From the table, we can observe silver has the lowest resistivity so it is the best conductor.