Physics, 29.01.2020 11:00 rutza

How do you work out the cross sectional area of a wire?

i need to calculate the resistivity of a wire at certain lengths.
i've calculated the resistance and found the diameter of the wire, so i'm guess that i just use pi x r^2, but my worksheet says to use 4/3 pi x r^3? !

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How do you work out the cross sectional area of a wire?

i need to calculate the resist...