Calculate the cross-sectional area, in mm2, of a piece of copper wire, 40 m in length and having a resistance of 0.25 ohm. Take the resistivity of copper as 0.02 × 10−6 ohm.

Q: I need help with Part A and B, could you label them as well. Thank you

A: Data we have Diameter of electrodes, D=5.00cm=5×10-2m distance,d=0.50mm=0.50×10-3m voltage,v=200v

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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.