Physics 9702 · AS & A Level · Force on a moving charge
Force on a moving charge — practice question
A slender rectangular piece of aluminium measures $65\,\text{mm}$ by $50\,\text{mm}$ by $0.10\,\text{mm}$, as shown in Fig. 9.1. Several corners of the piece are marked. A current $I$ of $3.8\,\text{A}$ is perpendicular to face RSXY of the piece. In aluminium, the free-electron number density is $6.0 \times 10^{28}\,\text{m}^{-3}$. A uniform magnetic field of magnetic flux density $B$ of $0.13\,\text{T}$ is perpendicular to face QRYZ of the aluminium piece, directed from Q to P. A Hall voltage $V_{H}$ appears across the piece and is described by the expression $V_{H} = \frac{BI}{ntq}$.
(a)[1]
From Fig. 9.1, state the size of the distance $t$.
$t = \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\,\text{mm}$
(b)[2]
Calculate the size of the Hall voltage $V_{H}$.
$V_{H} = \dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\dots\,\text{V}$
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\u0030.10\,\text{mm}$” …