(a)[2]
State the principle known as Lenz’s law.
(b(i)1)[1]
Fig. 7.1 shows a simple transformer with a soft-iron core. Explain why iron is used for the core.
(b(i)2)[2]
Fig. 7.1 shows a simple transformer with a soft-iron core. Explain why the core is laminated.
(b(ii))[4]
An e.m.f. is induced in the secondary coil of the transformer. Explain how the current in the primary coil leads to this induced e.m.f.
(b)
Fig. 7.1 shows a simple transformer with a soft-iron core.