Question

A potential difference of 12.0 V12.0 \mathrm{~V} is applied across a wire of crosssectional area 4.50 mm24.50 \mathrm{~mm}^2 and length 1000 . km. The current passing through the wire is 3.20103 A3.20 \cdot 10^{-3} \mathrm{~A}. b) What type of wire is this?

Solution

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Answered 11 months ago
Answered 11 months ago
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The known values:

A potential difference U=12 V\rightarrow U=12\text{ V}
A cross-sectional area of a wire A=4.5 mm2=4.5106 m2\rightarrow A=4.5\text{ mm}^{2}=4.5\cdot 10^{-6}\text{ m}^{2}
The length of a wire L=1000 km=106 m\rightarrow L=1000\text{ km}=10^{6}\text{ m}
The value of current i=3.2103 A\rightarrow i=3.2\cdot 10^{-3}\text{ A}

Additional information (from the previous part of the problem):

The resistance of the wire R=3750 Ω\rightarrow R=3750\text{ }\Omega

Requirement:

The type of the wire, i.e. the resistivity ρ\rightarrow \rho

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