# physics

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how much would you have to raise the temperature of a copper wire(originally at 20degree celcius) to increase its resistance by 15%? express your answer in percentage.note a=0.0068per degree celcius

• physics -

Ro + Ro*0.0068/oC*(T2 -T1) = 1.15Ro.
Divide both sides by Ro:
0.0068/oC*(T2-20) = 1.15,
T2-20 = 169,
T2 = 189oC.

%Increase = ((T2-T1)/T1)*100%
%Increase = ((189-20)/20)100 = 845%.

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