(a(i))[1]
State what is meant by a magnetic field here.
(a(ii))[1]
Define the direction of a magnetic field in terms of the force on a north pole.
(b)[2]
On Fig. 8.1, draw four lines to represent the electric field and its direction.
(c(i))[1]
Determine the e.m.f. of one cell in the circuit.
(c(ii))[1]
Determine the ratio of the p.d. across $R_2$ to the p.d. across $R_3$ in the circuit.
(c(iii).1)[1]
State and explain how the current in $R_1$ changes.
(c(iii).2)[1]
Determine the new value of the ratio of the p.d. across $R_2$ to the p.d. across $R_3$.