(a)[2]
Define magnetic flux by referring to the product of magnetic field strength and area.
(b(i))[3]
A simple transformer has two coils of wire wound on a soft-iron core, as shown in Fig. 9.1. There is a sinusoidal current in the primary coil. Explain how this current produces an induced electromotive force (e.m.f.) in the secondary coil.
(b(ii))[2]
Explain why the induced e.m.f. in the secondary coil does not remain constant.
(c)[2]
Explain why the soft-iron core in (b) has been laminated.