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CAIE A-Level Physics 20.4.2 Ferrous Cores in Solenoids

Practise explaining how a ferrous core strengthens a solenoid’s magnetic field and relating the effect to field patterns and magnetic permeability.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • explain that a ferrous core increases the magnetic field of a solenoid
  • relate the core effect to the field pattern or magnetic permeability

20.4.2—The magnetic field due to the current in a solenoid is increased by a question 1

[Maximum number: 1]

An ideal transformer is shown in Fig.9.1.

Fig. 9.1

Fig. 9.1

Explain

why the core is made of iron,

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