Solve. -At a Fixed Temperature, the Resistance R of a Wire

question 176

Multiple Choice

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 0.4 ohm when the diameter is 1 mm and the length is 200 cm, what is the
Resistance when the diameter is 2 mm and the length is 1620 cm?

• A)1.62 ohm
• B)162 ohm
• C)0.81 ohm
• D)405 ohm

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