(a)[2]
On Fig. 7.2, sketch a graph to show how $R$ changes with $l$ for values of $l$ from $l = 0$ to $l = 1.0\,\text{m}$. Put suitable values on the graph axes.
(b(i))[2]
State the meaning of electromotive force (e.m.f.).
(b(ii)(1))[2]
Calculate the current through the resistance wire.
(b(ii)(2))[1]
Calculate the potential difference (p.d.) from terminal P to terminal Q.
(b(ii)(3))[2]
Calculate the charge that flows through the resistance wire in $5.5\,\text{minutes}$.