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.
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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?
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A. About 447 ft
B. About 442 ft
C. About 432 ft
D. About 452 ft
E. About 462 ft
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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-1
A. m11n11
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C. 
D. 
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