25 \, A \) (current),
\( n = 8 \times 10^{19} \) (number of electrons per unit volume),
\( A = \frac{\pi d^2}{4} = \frac{\pi (2 \, mm)^2}{4} = 3.14 \times 10^{-6} \, m^2 \) (cross-sectional area of the wire),
\( e = 1.6 \times 10^{-19} \, C \) (charge of an
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