O-LevelPhysicsMagnetism5054/12 · May/June 2025 · Q351 Mark
A transformer is used to power a lamp. [Figure 35.1 - Transformer diagram] There are more turns on the secondary coil than on the primary coil. Which statement is correct?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThere is an alternating current (a.c.) in the primary coil and a direct current (d.c.) in the secondary coil.
BThere is a larger current in the secondary coil than in the primary coil.
CThere is a changing magnetic field in the iron core.
DIn the iron core there is an alternating current from the primary coil to the secondary coil.
✓ Correct answer
C: There is a changing magnetic field in the iron core.
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