To what temperature must you raise a silver wire (c = 0.0038), originally at 20.0°c, to double its resistance, neglecting any changes in dimensions? (you can assume that resistivity varies with temperature linearly)

Explanation:

Given a material with temperature coefficient of resistance c, the equation that relates the resistance at temperature and the resistance at temperature is

We want to double our resistance, so , thus having:

For this T must be:

which for our values means (with , remember to write temperature in S.I., and that for silver ):

this is poiselle's equation from fluid mechanic in physics. mech eng

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