A special copper extension cord has length L = 5.25 m and rectangular cross-section given by width w = 0.500 cm and small length = 0.300 cm . Between the ends of the cord there is a voltage difference given by V+ - V- . The current I = 10.0 (A) . See diagram below . The copper resistivity ρ = 1.72x10 -8 ohm-m. (a) What is the voltage difference V+ - V-? Does your answer seem reasonable? Explain. (b) How much heat is generated (in Joules) in a time period of 3.00 minutes? (c) What is the magnitude E of the electric field in the extension cord?

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A special copper extension cord  has length L = 5.25 m  and rectangular  cross-section given by width w =  0.500 cm and small length  = 0.300 cm . Between the ends of the cord there is a voltage difference given by V+  -  V . The current I = 10.0 (A) . See diagram below .  The copper resistivity ρ  = 1.72x10 -8 ohm-m.

(a) What is the voltage difference V+  -  V-?  Does your answer seem reasonable? Explain.
(b) How much heat is generated (in Joules) in a time period of 3.00 minutes? 
(c) What is the magnitude E of the electric field in the extension cord?

V
0.300 cm
0.500 cm
Transcribed Image Text:V 0.300 cm 0.500 cm
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