Pure copper has a resistivity of 1.68 × 10−8 Ωm. Some accurate cubes of copper are prepared, and electrical measurements are made, for which current is passed across a pair of opposite faces. a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Explain your answer. b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resistance between opposite faces of the stack? Calculate the resistance of each stack.

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.