What is the resistance of a 10-cm-long piece of iron with a 1.5 mm × 1.5 mm square cross section? I got 0.43 ohms, but it isn t right?
Update:
I did (9.71x10^-8)*.1/2.25x10^-8. Obviously it isn't correct
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L = 0.1 m
A = 2.25 x 10^-6
R = (9.71x10^-8)* 0.1/(2.25 * 10^-6) = 0.0043 Ohms