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The resistance R of a uniform conductor of length l and cross-section A made of material with resistivity ρ is
AR = ρ A / l
BR = ρ l A
CR = ρ l / A
DR = l / (ρ A)
Answer & Solution
Correct answer: C. R = ρ l / A
R = ρ · l/A. Doubling length doubles R; doubling area halves R.
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