Which expression gives the resistance of a uniform cylindrical conductor that has length

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

Problem

Which expression gives the resistance RR of a uniform cylindrical conductor that has length ll, cross-sectional area AA, and resistivity ρ\rho? (a) R=ρlR=\dfrac{\rho}{l} (b) R=ρ lAR=\dfrac{\rho\,l}{A} (c) R=ρ Al3R=\dfrac{\rho\,A}{l^{3}} (d) R=ρ l3A2R=\dfrac{\rho\,l^{3}}{A^{2}}

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