Physics · May / June 2024 · Paper 12 · Question 36

The diagram shows a transformer. [diagram: primary coil, secondary coil, soft iron core] A student writes four statements about how the transformer works. 1 An alternating voltage across the primary coil induces an unchanging voltage across the secondary coil. 2 An alternating voltage across the primary coil produces a changing magnetic field in the iron core. 3 A changing magnetic field in the iron core induces an alternating voltage across the secondary coil. 4 An unchanging voltage across the primary coil produces a changing magnetic field across the secondary coil. Which statements explain how the transformer works?

1. A1 and 2
2. B1 and 4
3. C2 and 3
4. D3 and 4

As printed in the paper