Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.
Understanding
- I can define magnetic flux and explain why only the part of B perpendicular to a surface counts. (Guide: “Magnetic flux”, Figure 1; Practice Q1)
- I can describe the area vector and say what a positive or negative flux means. (Guide: “Magnetic flux”)
- I can name the three ways to change the flux through a loop. (Guide: “Three ways to change the flux”)
- I can explain why an emf needs a changing flux, and why an open loop has an emf but no current. (Guide: “Faraday’s law”; Practice Q4)
- I can explain Lenz’s law as a consequence of energy conservation. (Guide: “Lenz’s law”; Practice Q7c)
Calculation and skills
- I can calculate Φ = BA cos θ, taking θ from the area vector. (Practice Q1)
- I can calculate the average emf and current for a coil of N turns. (Guide: Worked example 1; Practice Q3, Q5)
- I can find the direction of an induced current with the four Lenz steps and the right-hand rule. (Guide: Worked example 1; Practice Q2, Q5c)
- I can derive ε = Bℓv for a rod on rails and use it with I = ε/R and F = IℓB. (Guide: “The rod on rails”, Worked example 2; Practice Q7)
- I can sketch an emf–time graph from a flux–time graph, and sketch both for a loop moving through a field. (Guide: Figure 3; Practice Q4, Q6)
Reasoning
- I can predict how the emf changes when N, the area, the change in field or the time interval changes. (Practice Q3)
- I can explain why a rod falling on rails reaches a terminal speed and predict how it depends on R. (Practice Q7)
- I can justify a direction with a full chain of reasoning, not just “by Lenz’s law”. (Practice Q6c)
All ticked? Unit 12 is complete. Move on to Topic 13.1, Reflection, with the Topic 13.1 study guide, or return to the course roadmap.