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 1.05 ohm when the diameter is 1 mm and the length is 210 cm, what is the resistance when the diameter is 4 mm and the length is 2220 cm?
A. 145.688 ohm
B. 2.775 ohm
C. 138.75 ohm
D. 0.694 ohm
Answer: D
Mathematics
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