Question
When 115 $\mathrm{V}$ is applied across a wire that is 10 $\mathrm{m}$ long and has a 0.30 $\mathrm{mm}$ radius, the magnitude of the current density is $1.4 \times$$10^{8} \mathrm{A} / \mathrm{m}^{2} .$ Find the resistivity of the wire.
Step 1
Step 1: We know that the electric field in a wire is given by $E = V/L$, where $V$ is the potential difference along the wire and $L$ is the length of the wire. Show more…
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39. When Applied When $115 \mathrm{~V}$ is applied across a wire that is $10 \mathrm{~m}$ long and has a $0.30 \mathrm{~mm}$ radius, the current density is $1.4 \times 10^{4} \mathrm{~A} / \mathrm{m}^{2}$. Find the resistivity of the wire.
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When 120 V is applied across a wire that is 7.6 m long and has a 0.29 mm radius, the magnitude of the current density is 1.8 × 104 A/m2. Find the resistivity of the wire.
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