Question
What is the resistance of a copper wire of length $l=$ $10.9 \mathrm{~m}$ and diameter $d=1.3 \mathrm{~mm} ?$ The resistivity of copper is $1.72 \cdot 10^{-8} \Omega \mathrm{m}$
Step 1
The radius is half of the diameter, so we have: \[ r = \frac{d}{2} = \frac{1.3 \, \text{mm}}{2} = 0.65 \, \text{mm} = 0.65 \times 10^{-3} \, \text{m} \] Show more…
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