Use the Fact That the Resistance of a Wire Carrying

question 47

Multiple Choice

Use the fact that the resistance of a wire carrying an electrical current is directly proportional to its length and inversely proportional to its cross-sectional area. ​
If #28 copper wire (which has a diameter of 0.0126 inch) has a resistance of 68.17 ohms per thousand feet,what length of #28 copper wire will produce a resistance of 30.5 ohms?
​

• A)About 447 ft
• B)About 442 ft
• C)About 432 ft
• D)About 452 ft
• E)About 462 ft

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