PhysicsCurrent electricityJAMB
A wire has a resistance of 10 Ω. Another wire of the same material, twice as long and with twice the cross-sectional area, has a resistance of
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Answer: A. 10 Ω
R = ρL/A: doubling L and A leaves R unchanged.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.