A transformer has a primary coil and a secondary coil wound on a soft-iron core.
Identify the option for each row that best describes the magnetic field in the soft-iron core under the given condition.
| Primary coil current | Constantly changing magnetic field | Constant (steady) magnetic field | Zero magnetic field |
|---|---|---|---|
| Alternating current (a.c.) | |||
| Steady direct current (d.c.) |
State and explain the effect on the output voltage across the secondary coil of:
increasing the number of turns on the secondary coil (while keeping the primary coil input the same).
State and explain the effect on the output voltage across the secondary coil of:
replacing the soft-iron core with a non-magnetic plastic core.
136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.