(a)[1]
Between which faces is the Hall voltage $V_H$ developed?
(b(i))[3]
The current $I$ is carried by particles of charge $+q$ that travel at speed $v$ in the direction of the current. The number density of these charge carriers is $n$. Obtain an expression connecting the Hall voltage $V_H$ with $v$, $B$ and $d$, where $d$ is one dimension of the slice.
(b(ii))[2]
Use your answer in (b)(i) together with an expression for the current $I$ in the slice to derive $V_H = \frac{BI}{ntq}$. Show your steps.
(c)[2]
Explain why the Hall voltage is hard to detect in a thin slice of copper.