(a)[1]
State the magnitude of $t$ by referring to Fig. 9.1.
(b)[2]
Calculate the magnitude of the Hall voltage $V_{H}$.
Physics 9702 · AS & A Level · Force on a moving charge
Force on a moving charge — practice question
Fig. 9.1 shows a thin rectangular aluminium slice with side lengths of $65\,\text{mm}$, $50\,\text{mm}$ and $0.10\,\text{mm}$. Some corners on the slice are labelled. A current $I$ of $3.8\,\text{A}$ is directed normal to face RSXY of the slice. Aluminium contains $6.0 \times 10^{28}\,\text{m}^{-3}$ free electrons per unit volume. A uniform magnetic field with magnetic flux density $B$ of $0.13\,\text{T}$ is normal to face QRYZ of the aluminium slice and points from Q to P. A Hall voltage $V_{H}$ is produced across the slice and is described by $V_{H} = \frac{BI}{ntq}$.