CAIE IGCSE Physics 4.5.1.4 Direction of an induced e.m.f. opposes
Practise applying Lenz's law to coils, solenoids and moving conductors, using pole labels and force directions in diagrams.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- determine induced pole labels when a magnet approaches or leaves a coil
- explain that the induced current produces a force opposing the motion or change
- choose the force direction on a moving wire from Lenz's law and the field direction
4.5.1.4—Direction of an induced e.m.f. opposes question 1
Fig. 9.1 shows a permanent bar magnet next to a circuit that contains a coil and a galvanometer.
Fig. 9.1
The magnet is moved to the left and inserted a small distance into the coil. The galvanometer deflects briefly and shows that there is a current in the coil.
As the magnet is moving near to the coil, end Q of the coil behaves as a magnetic pole. State the polarity of end Q and explain why it has this polarity.
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