(a)[1]
State whether coil A or coil B in the transformer has the larger number of turns. Give a reason for your response.
(b)[1]
One purpose of using an iron core in the transformer is to strengthen the magnetic field inside coil A. State one further purpose of using the iron core.
(c)[1]
Describe briefly how an output voltage is induced in coil B.
(d)[2]
Suggest one benefit and one drawback of burying a power line underground instead of using an overhead power line.