A copper wire is (50 m) long, and has a cross-sectional area of (5 mm2). a/ Calculate the resistance of this wire at a temperature of ( 30°C), if you know that the resistivity of copper at this temperature equal to (1.8× 10-8 Q m). b/ What is the resistance of the wire if heated to (90°C)? Note that the resistivity of copper at a temperature of ( 20°C) equal to (1.724x 10-8 Q m), and the temperature coefficient of resistivity of copper is (0.004 C)?

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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Question
A copper wire is (50 m) long, and has a cross-sectional area of (5 mm2).
al Calculate the resistance of this wire at a temperature of ( 30°C), if you know that
the resistivity of copper at this temperature equal to (1.8× 10-8 Q m).
b/ What is the resistance of the wire if heated to ( 90°C)? Note that the resistivity of
copper at a temperature of ( 20°C) equal to (1.724x 10-8Q m), and the temperature
coefficient of resistivity of copper is (0.004 C)?
Transcribed Image Text:A copper wire is (50 m) long, and has a cross-sectional area of (5 mm2). al Calculate the resistance of this wire at a temperature of ( 30°C), if you know that the resistivity of copper at this temperature equal to (1.8× 10-8 Q m). b/ What is the resistance of the wire if heated to ( 90°C)? Note that the resistivity of copper at a temperature of ( 20°C) equal to (1.724x 10-8Q m), and the temperature coefficient of resistivity of copper is (0.004 C)?
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