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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A 10-foot piece of copper wire produces a resistance of 0.2 ohm. Use the constant of proportionality k = 0.000833 to find the diameter of the wire.
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(Round the answer up to three decimal places.)
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A. 0.23 ft
B. 0.58 ft
C. 0.38 ft
D. 0.48 ft
E. 0.73 ft
Answer: A
Mathematics
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