# Use the data in Table 12.2 to answer the following - Table 12.2 Electrical resistivity of some substances at 20°C

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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?

Table 12.2 Electrical resistivity of some substances at 20°C

 − Material Resistivity (Ω m) Conductors Silver 1.60 × 10−8 Copper 1.62 × 10−8 Aluminium 2.63 × 10−8 Tungsten 5.20 × 10−8 Nickel 6.84 × 10−8 Iron 10.0 × 10−8 Chromium 12.9 × 10−8 Mercury 94.0 × 10−8 Manganese 1.84 × 10−6 Constantan (alloy of Cu and Ni) 49 × 10−6 Alloys Manganin (alloy of Cu, Mn and Ni) 44 × 10−6 Nichrome (alloy of Ni, Cr, Mn and Fe) 100 × 10−6 Glass 1010 − 1014 Insulators Hard rubber 1013 − 1016 Ebonite 1015 − 1017 Diamond 1012 − 1013 Paper (dry) 1012

## 1 Answer

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(a) Resistivity of iron = 10.0 x 10-8 Ω
Resistivity of mercury = 94.0 x 10-8 Ω
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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