(a(i))[1]
On Fig. 10.1, draw an arrow on every circle to show the magnetic field direction.
(a(ii))[1]
State why the gap between the circles becomes larger as the distance from the wire increases.
(b(i))[4]
Describe and explain what happens when the switch S is closed.
(b(ii))[2]
Describe and explain what happens when the switch S is reopened.