Which of the following expressions gives the resistance R of a uniform conductor of…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Which of the following expressions gives the resistance R of a uniform conductor of length l, cross-sectional area A and resistivity ρ? (a) 2 ρ lA2\,\rho \,\dfrac{l}{A} (b) ρ lA\rho \,\dfrac{l}{A} (c) ρ lπA\rho \,\dfrac{l}{\pi A} (d) ρ l4A\rho \,\dfrac{l}{4A}

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