A student wants to compare the resistivity of two different materials using wires of identical length and cross-sectional area. Which measurement must be made for both wires to determine their resistivity?
Measuring the resistance of each wire
Resistivity of a material is related to the resistance of a wire by the formula R = (resistivity x length) / (area of cross-section).
Since the length and cross-sectional area of both wires are already identical, the only unknown needed to calculate and compare resistivity is the resistance of each wire.
Measuring mass, brightness, or voltage alone does not directly give the resistivity without knowing the resistance, so resistance must be measured for both wires.
Hence, the correct answer is measuring the resistance of each wire.
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