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If a copper wire has a resistance of 28.2 ohm at a temperature of 24.5 oC, what resistance does it have at 68.8 oC? (Neglect any change in length or cross-sectional area resulting from the change in temperature.)
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Added Sun, 05 Jul '15
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R is the resistance known at particular temperature
R_{0} is the resistance to be known a particular temperature

\alpha= coefficient of resistance (? = 0.004041 for copper)

T_{0}=Temperature to be known

T= initial temperature

after substituting all the values we get 33.248 ohms as the value of resistance
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