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## anonymous 3 years ago What would be the resistance of a piece of aluminium wire 1.8 mm in diameter and 10 m long?(The resistivity of aluminium is 2.8 × 10–8 Ω m.)

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1. anonymous

$R=\rho L/A$

2. anonymous

Yes so for A I did... π * ((0.9)^-3)^2 and got 5.91 m^2

3. anonymous

Is that correct? :o

4. anonymous

if you mean $$A=\pi\times(0.9\times10^{-3})^2$$, you're correct.

5. anonymous

Oops now I realise why I've got the wrong answer... I forgot to add in the x10 bit :P Thank you

6. anonymous

:)

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