Solve.At a fixed temperature, the resistance R of a wire varies directly as the length l and inversely as the square of its diameter d. If the resistance is 0.63 ohm when the diameter is 1 mm and the length is 210 cm, what is the resistance when the diameter is 3 mm and the length is 1370 cm?
A. 0.457 ohm
B. 1.37 ohm
C. 152.222 ohm
D. 95.9 ohm
Answer: A
Mathematics
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