The diameter of the wire is given as 2 mm, so the radius \( r \) is half of that:
\[ r = \frac{2 \, \text{mm}}{2} = 1 \, \text{mm} = 1 \times 10^{-3} \, \text{m} \]
The cross-sectional area \( A \) of the wire is given by the formula for the area of a circle:
\[
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