Electrons are made to flow through the copper strip of Figure P27.57. The strip's cross section is \(1.00 \mathrm{~mm}\) high and \(30.5 \mathrm{~mm}\) wide, and the strip is placed in a \(2.00-\mathrm{T}\) magnetic field that is directed out of the page. If the number of mobile electrons per unit volume in the copper is \(8.46 \times 10^{28} \mathrm{~m}^{-3}\) and the current in the strip is \(12 \mathrm{~A}\), calculate the potential difference across the width of the strip when conditions have been allowed to equilibrate.

Data from Figure P27.57

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30.5 mm B = 2.00 T