(a(i))[2]
Fig. 9.2 shows how $B$ varies with time $t$. Show that, for the interval from $t = 0$ to $t = 0.20\,\text{s}$, the electromotive force (e.m.f.) induced in the coil is $0.080\,\text{V}$.
(a(ii))[4]
On the axes in Fig. 9.3, plot the way the induced e.m.f. $E$ changes with time $t$ for $t = 0$ to $t = 0.80\,\text{s}$.
(b)[4]
Use laws of electromagnetic induction to explain why a torque acts on the aluminium disc.