WAEC Physics 2010 Paper

Concept:The resistance of a wire depends on its dimensions and material, not on its mass.Explanation:Resistance is given by $R = \rho \frac{L}{A}$, where $L$ is the length, $A$ is the cross-sectional area, and $\rho$ is the resistivity.Resistivity $\rho$ depends on the material and changes with temperature.Thus, resistance is affected by length, cross-sectional area, and temperature.Mass does not appear in the formula for resistance.Answer:The factor that does not affect the electric resistance of a wire is mass.Therefore, the correct option is B.