LuduminaMG-07 · MG-U3 · Planned
Induced potential and opposing change
Learning objectives
Explain when p.d./current are induced; predict directions and magnitude changes; explain opposition to the causing change.
8463 §§4.7.3.1 / No Trilogy counterpart
DfE single-science pp.41–42 / Combined pp.34–35. Evidence checked 30 September–1 October 2026. Skills: WS1.2,1.4,2.2,3.6.
Explanation
Induced p.d. requires relative motion or changing magnetic field conditions. A closed circuit is needed for induced current. The induced current’s field opposes the change causing it, linking induction to energy conservation and resisting easy energy creation.
Concepts, equations and units: Induction needs changing field through/relative to conductor; p.d. V, I A; closed circuit needed for current; no flux-rate formula required.
Prediction, demonstration and game exercise
Predict, observe, explain
Move magnet into/out of coil then hold it still; compare open/closed circuits and speeds.
Planned learner game exercise
Choose magnet motion, coil turns and field strength for a supplied output; label induced polarity and opposing response.
Independent practice
Four prediction cases and a conservation-based explanation of mechanical resistance.
Original practice example · Separate Physics Higher
A magnet is held still beside a stationary coil with an unchanging field. Is a p.d. continuously induced?
Show working and model answer
Working / reasoning
There is no change in the relevant magnetic field configuration or relative motion.
Answer
No continuous induced p.d. in this stated setup.
Exit check and success criteria
Three predictions correct, stationary case zero and open-circuit p.d. distinguished from current.
During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.
Misconceptions, practical links and mastery
Check these misconceptions
Any magnet beside a coil induces current; induced field opposes the field itself rather than its change; current exists in an open circuit.
Practical preparation
Optional magnet–coil–meter investigation; no RP.
Virtual preparation and revision only. Required hands-on activities and school records remain separate.
Proposed mastery
0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.