Answer: A cylindrical copper cable 1.50 km long is

Chapter 25, Problem 74P

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QUESTION:

Problem 74P

A cylindrical copper cable 1.50 km long is connected across a 220.0-V potential difference. (a) What should be its diameter so that it produces heat at a rate of 75.0 W? (b) What is the electric field inside the cable under these conditions?

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QUESTION:

Problem 74P

A cylindrical copper cable 1.50 km long is connected across a 220.0-V potential difference. (a) What should be its diameter so that it produces heat at a rate of 75.0 W? (b) What is the electric field inside the cable under these conditions?

ANSWER:

Solution 74P

Problem (a)

Step 1:

        To find the diameter of the cable

        Length of the cylindrical copper cable L = 1.5 km or 1500 m

        Potential difference across the cable V = 220.0 V        

        Power produced by the heat P = 75.0 W

        Resistivity of copper = 1.72 x 10-8 

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