2. A cylindrical copper cable 1.50 km long is connected across a 220-V potential difference. The resistivity of copper at room temperature (-293 K) is 1.72 x 10 m. a. What should be its diameter so that it produces heat (i.e. dissipates electrical energy) at a rate of 90.0 W? b. What is the electric field inside the cable under these conditions? c. What is the current flowing through the copper cable?
2. A cylindrical copper cable 1.50 km long is connected across a 220-V potential difference. The resistivity of copper at room temperature (-293 K) is 1.72 x 10 m. a. What should be its diameter so that it produces heat (i.e. dissipates electrical energy) at a rate of 90.0 W? b. What is the electric field inside the cable under these conditions? c. What is the current flowing through the copper cable?
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Transcribed Image Text:2. A cylindrical copper cable 1.50 km long is connected across a 220-V potential difference.
The resistivity of copper at room temperature (-293 K) is 1.72 x 10¹ m.
a. What should be its diameter so that it produces heat (.e. dissipates electrical energy)
at a rate of 90.0 W?
b. What is the electric field inside the cable under these conditions?
c. What is the current flowing through the copper cable?
d.
If the temperature of the copper cable increases by 10 degrees, what is the new
resistivity of the copper cable and what is the new rate at which it produces heat?
Neglect the effect of changes in the cable's dimensions.
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