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How does the resistivity of a consuctor ...

How does the resistivity of a consuctor depend upon temperature electrical consuctivity ?

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(i) The resistivity of a conductor increases with increase in temperature
`:. rho_(T)=rho_(o) [1+alpha (T-T_(o))]`
(ii) The resistivity of a consuctor is the reciprocal of electrical conductivity
`:. rho=1/sigma`
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