Question

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.)

Answer 1

\[R=\rho L/A\]

Answer 2

Yes so for A I did...

π * ((0.9)^-3)^2 and got 5.91 m^2

Answer 3

Is that correct? :o

Answer 4

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

Answer 5

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

Answer 6

:)