The diagram depicts a transformer. A student records four statements about the way the transformer operates. 1. An alternating voltage across the primary coil leads to an unchanging voltage across the secondary coil. 2. An alternating voltage across the primary coil creates a changing magnetic field in the iron core. 3. A changing magnetic field in the iron core leads to an alternating voltage across the secondary coil. 4. An unchanging voltage across the primary coil creates a changing magnetic field across the secondary coil. Which statements describe how the transformer works?
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4