CAPE Physics Unit 2 · 2005 · Paper 1 · Question 1(a)(ii)

Questions on charge carriers and current in conductors and solutions.

Figure 1 shows a current i flowing through a length of wire L with cross-sectional area A, containing n charge carriers per unit volume, with average drift velocity v_d and charge q on each carrier. Show that the drift velocity v_d of the charge carriers is given by v_d = I / (n q A).

This question uses a figure or table from the paper — you'll see it when you practise.