Question 515476: ELECTRICAL RESISTANCE: The electrical resistance of a wire, R, varies directly as its length, L, and inversely as its cross-sectional area, A. If the resistance of a wire is 0.2 ohm when the length is 200 ft and its cross-sectional area is 0.05 square inch. Find the resistance of a wire whose length is 5000 ft with a cross-sectional area of 0.01 square inch.
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! ELECTRICAL RESISTANCE: The electrical resistance of a wire, R, varies directly as its length, L, and inversely as its cross-sectional area, A. If the resistance of a wire is 0.2 ohm when the length is 200 ft and its cross-sectional area is 0.05 square inch. Find the resistance of a wire whose length is 5000 ft with a cross-sectional area of 0.01 square inch.
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since the length increased and cross sectional area decreased, the resistance would increase in both cases.
R=0.2*5000/200*0.5/0.1=25 ohms
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