The two ends of a metal rod are linked to a very sensitive ammeter by copper wire. The rod is kept horizontal in the horizontal magnetic field between the N-pole and S-pole of a permanent magnet, as shown in Fig. 9.1.
(a(i))[2]
State two factors that affect the magnitude of the induced e.m.f.
(a(ii))[1]
The size of the current in the ammeter depends on the size of the induced e.m.f. State one other factor that influences the size of the current.
(a(iii))[2]
State and explain the change in the induced e.m.f.
(b(i))[2]
On Fig. 9.4, sketch a graph showing how the e.m.f. changes with time for two complete revolutions of the coil.
(b(ii))[1]
On your sketch in Fig. 9.4, mark a letter T to show a time when the coil is horizontal, as shown in Fig. 9.3.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Any two of: speed of rod; length of rod / angle between field and rod; magnetic field strength / separation of poles” …