# physics

The resistance of a coil copper wire at 20 degree celsius is 2.21 ohms. After a current of 10 amperes has been flowing in wire for two hours, the resistance of the coil was found o be 2.59 ohms. What is the temperature rise?

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1. The Temperature Coefficient of Copper (near
room temperature) is +0.393 % per o
C. This
means if the temperature increases 1o
C the
resistance will increase 0.393%.

does that help?

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posted by Matt

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