An aluminium wire has diameter 0.5 mm and resistivity 2.8 into 10 to the power minus 16 ohm cm. how much length of its wire is required to make a 10 ohm wire
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Answer:
The formula is Resistance=Rho * Length/Area so that
Length=Resistance * Area/Rho.
Area is Pi/4 times diameter squared, or 0.001963 square cm.
Then length is 10 ohms *.001963 square cm / 2.8E-6 ohm cm or 7012 cm, same as 70.12 meter.
Explanation:
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