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Question 5
Use the data in Table to answer the following –

(a) Which among iron and mercury is a better conductor?
(b) Which material is the best conductor?

Table: Electrical resistivity of some substances at 20C
MaterialResistivity(Ωm)ConductorsSilver1.60×108Copper1.62×108Aluminium2.63×108Tungsten5.20×108Nickel6.84×108Iron10.0×108Chromium12.9×108Mercury94.0×108Manganese1.84×106AlloysConstantan(alloy of Cu Ni)49×106Manganin(alloy of Cu,Mn and Ni)44×106Nichrome(alloy of Ni,Cr,Mn and Fe)100×106InsulatorsGlass10101014Hard rubber10131016Ebonite10151017Diamond10121013Paper(dry)1012


Solution

(a) Resistivity of iron = 10.0×108Ω m
Resistivity of mercury = 94.0×108Ω m
The 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 the table that the resistivity of silver is the lowest among the listed materials. Hence, it is the best conductor.

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