LuduminaMG-03 · MG-U1 · Planned
Current, solenoids and electromagnets
Learning objectives
Sketch current-produced fields; predict effects of current, distance, coil shape and iron core; P: interpret device diagrams.
8463 §§4.7.2.1 / 8464 §§6.7.2.1
DfE single-science pp.41–42 / Combined pp.34–35. Evidence checked 30 September–1 October 2026. Skills: WS1.2,1.4,2.2; MS5b.
Explanation
A current produces a surrounding magnetic field. Shaping the conductor into a solenoid combines effects into a strong interior field; an iron core strengthens it. Reversing current reverses field direction. Device diagrams are an extra separate-Physics requirement.
Concepts, equations and units: A,T when quantified later; straight-wire circular field; solenoid strong approximately uniform interior; core strengthens field.
Prediction, demonstration and game exercise
Predict, observe, explain
Reverse current to reverse directions; compare wire, solenoid and iron-core models.
Planned learner game exercise
Build an electromagnet for a lifting target with labelled current/core choices; P diagnose a relay or bell diagram.
Independent practice
Draw wire/coil fields and explain two strengthening changes; P one device causal chain.
Original practice example · Shared
Name two changes that can strengthen the model solenoid’s magnetic effect.
Show working and model answer
Working / reasoning
Increase current within safe apparatus limits; insert an iron core. The coil arrangement also strengthens the interior effect.
Answer
Greater current and an iron core are valid choices.
Exit check and success criteria
Correct directions for supplied current and explanation identifies current/core; P device explanation complete.
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 coil becomes a permanent magnet; magnetic effect requires motion of the whole wire; detailed device interpretation is shared specification.
Practical preparation
Optional low-voltage electromagnet 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.