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