WAEC Physics 2012 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2012 Objective paper, with the correct answer and a full explanation.
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The resistivity ρ of a material of length l, cross-sectional area A, resistance R, is given by the equation
- A. A. ρ = RA/lCorrect
- B. B. ρ = l/RA
- C. C. ρ = Rl/A
- D. D. ρ = R/Al
Explanation
Resistivity ρ = RA/l, where R is resistance, A is cross-sectional area and l is length.
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