The diameter of the wire is given as 0.84 mm. First, convert this to meters:
\[ 0.84 \, \text{mm} = 0.84 \times 10^{-3} \, \text{m} \]
The radius \( r \) of the wire is half of the diameter:
\[ r = \frac{0.84 \times 10^{-3}}{2} = 0.42 \times 10^{-3} \,
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