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Question

A potential difference of $12.0 \mathrm{~V}$ is applied across a wire of crosssectional area $4.50 \mathrm{~mm}^2$ and length 1000 . km. The current passing through the wire is $3.20 \cdot 10^{-3} \mathrm{~A}$. b) What type of wire is this?

Solution

VerifiedAnswered 11 months ago

Answered 11 months ago

Step 1

1 of 4**The known values:**

A potential difference $\rightarrow U=12\text{ V}$

A cross-sectional area of a wire $\rightarrow A=4.5\text{ mm}^{2}=4.5\cdot 10^{-6}\text{ m}^{2}$

The length of a wire $\rightarrow L=1000\text{ km}=10^{6}\text{ m}$

The value of current $\rightarrow i=3.2\cdot 10^{-3}\text{ A}$

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

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

**Requirement:**

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

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