(a)[2]
State what the term magnetic field means.
(b(i))[1]
On Fig. 9.1, shade the face of the foil on which electrons first collect.
(b(ii))[3]
Explain why electrons do not keep collecting on the face you have shaded.
(c(i))[1]
The Hall voltage $V_H$ produced across the foil in (b) is given by $V_H = \frac{BI}{ntq}$, where $I$ is the current in the foil. State the meaning of the quantity $n$.
(c(ii))[1]
Using the letters on Fig. 9.1, identify which pair of points gives the distance $t$.
(d)[1]
Suggest why, in practice, Hall probes are usually made from a semiconductor material instead of a metal.