In household wiring, copper wire 2.05 $\mathrm{mm}$ in diameter is often used. Find the resistance of a 24.0 -m length of this wire.
Added by Christina F.
Step 1
Since the diameter is 2.5 mm, the radius is half of that, so \( r = 1.25 \, mm = 1.25 \times 10^{-3} \, m \). \[ A = \pi \times (1.25 \times 10^{-3})^2 \] Show more…
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