Pure copper has a resistivity of 1.68 × 10–8 Nm. 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? Ex- plain your answer. b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resis- tance between opposite faces of the stack? Calculate the resistance of each stack.

If the resistivity of copper is less than that of gold at room temperature, which of the following statements must be true? a) Gold has a higher resistance than copper. b) The sample of gold is thinner than a sample of copper. c) There is more current flowing in the gold than in the copper. d) Electrons in gold are more likely to be scattered than electrons in copper at room temperature when they are accelerated by the same electric field.

Please help because I don't know what I did wrong...final units is correct but the my value is wrong.

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 oppositefaces.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.