The Resistance of a Wire Varies Directly with Its Length

question 153

Multiple Choice

The resistance of a wire varies directly with its length and inversely with the square of its diameter. If 100 feet of wire with diameter 0.03 inch has a resistance of 30 ohms, what is the resistance of 60 feet of the same type of wire if its diameter is 0.06 inch?

• A) 0.9 ohms
• B) 45 ohms
• C) 0.018 ohms
• D) 4.5 ohms
• E) 9.0 ohms

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