A long copper strip 1.8 cm wide and 1.0 mm thick is placed in a 1.2-T magnetic field as in Fig. 20–21a. When a steady current of 15 A passes through it, the Hall emf is measured to be 1.02 \; \mu V . Determine a) the drift velocity of the electrons and b) the density of free (conducting) electrons (number per unit volume) in the copper. [Hint: See also Section 18–8.]

the drift velocity of the electrons and
the density of free (conducting) electrons (number per unit volume) in the copper. [Hint: See also Section 18–8.]

Figure 20-21. The Hall effect. (a) Negative charges moving to the right as the current.

$4.7 \times 10^{-5} \textrm{ m/s}$
$1.1 \times 10^{29} \textrm{ electrons/m}^3$

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A long copper strip 1.8 cm wide and 1.0 mm thick is placed in a 1.2-T magnetic field as in Fig. 20–21a. When a steady current of 15 A passes through it, the Hall emf is measured to be 1.02 μV1.02 \; \mu \textrm{V}1.02μV. Determine

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A long copper strip 1.8 cm wide and 1.0 mm thick is placed in a 1.2-T magnetic field as in Fig. 20–21a. When a steady current of 15 A passes through it, the Hall emf is measured to be $1.02 \; \mu \textrm{V}$ . Determine