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CAIE IGCSE Physics Strength of Magnetic Fields from Current

Practise comparing magnetic field strength around straight wires and solenoids, using distance, position and field-line spacing to justify each choice.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • identify the strongest field nearest a straight wire where circular field lines are closest
  • state that a straight wire's magnetic field becomes weaker as distance from the wire increases
  • compare positions inside and outside a solenoid from line density or a supplied strength graph

4.5.3.4—Qualitative variation of the strength question 1

[Maximum number: 1]

Fig. 10.1 shows a wire that carries a current into the page. The circles on Fig. 10.1 show the pattern of the magnetic field around the wire.

Fig. 10.1

Fig. 10.1

State why the spacing of the circles increases as the distance from the wire increases.

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