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Electrical reslstivities of some substan...

Electrical reslstivities of some substances, In ohm- meter, at `20^(@)` C are given as follows :

Name the material that you would advise to be used in the heater elements of electric heating , device and why ?

Text Solution

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(a) Resitivity of iron `=10.0xx10^(-8)Omega`
Resistivity of mercury`=9.4xx10^(-8)Omega`
(a) 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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