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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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