Resistance and Resistivity: The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?
A. the cross-sectional area of the wire
B. the resistivity of the material of which the wire is made
C. the product of the resistivity and the cross-sectional area of the wire
D. the resistivity of the material divided by the cross-sectional area of the wire
E. the reciprocal of the resistivity of the material
Answer: D
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