Question text
36 The diagram shows a transformer. soft iron core primary coil secondary coil 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? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4
36 The diagram shows a transformer.
soft iron core
primary coil secondary coil
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?
A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4
Select your answer: