The Electrical Resistance of a Copper Wire Varies Directly with Its

question 90

Multiple Choice

The electrical resistance of a copper wire varies directly with its length and inversely with the square of the diameter of the wire. If a wire 20 m long with a diameter of 4 mm has a resistance of 35 , find the resistance of a wire 30 mm long with a diameter of 4.5 mm. Round your answer to two decimal places.

• A) 39.64
• B) 40.26
• C) 41.48
• D) 42.35

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