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The resistivity ρof a conducting wire is the reciprocal of the conductivity and is measured in units of ohm-meters (Ω-m). The resistivity of a given metal depends on the temperature according to the equation ρ(t) = ρ20e^α^t-20 where t is the temperature in ^oC. There are tables that list the values of (called the temperature coefficient) and ρ20 (the resistivity at 20^oC ) for various metals. Except at very low temperatures, the resistivity varies almost linearly with temperature and so it is co
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