Question 5:
Use the data in Table 12.2 to answer the following −
Table 12.2 Electrical resistivity of some substances at 20°C
(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?
Answer:
(a) Resistivity of iron = 10.0 × 10−8 Ω m
Resistivity of mercury = 94.0 × 10−8 Ω m
Resistivity of mercury is more than that of iron. This implies that iron is a better
conductor than mercury.
(b) It can be observed from Table 12.2 that the resistivity of silver is the lowest
among the listed materials. Hence, it is the best conductor.
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