THE TRANSFORMER
2 marks · NormalState the purpose of a soft iron core in a transformer.
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Also accept: To increase the linkage of the magnetic field between the primary and secondary coils; To enable efficient magnetic coupling between coils
Common mistakes: To conduct electricity; To strengthen the voltage
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Marking points
B1 · 1 mark · States that the soft iron core increases (or improves) magnetic field linkage or coupling between primary and secondary coils.
B2 · 1 mark · Allows for efficient transformer action or minimises magnetic losses.
Worked solution
The soft iron core in a transformer increases the linkage of the magnetic field between the primary and secondary coils, allowing efficient transfer of the alternating magnetic field. This ensures efficient transformer operation with minimal energy loss.