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 explain in words what electric flux measures and give its unit, N·m²/C. (Guide: “What flux measures”)
- I can define the area vector of a surface and state which way it points on a closed surface. (Guide: “The area vector”; Practice Q2)
- I can explain why flux is a scalar and what a negative flux means. (Guide: “Flux through a flat surface in a uniform field”; Practice Q4)
- I can explain why the net flux through a closed surface in a uniform field is zero. (Guide: “Closed surfaces”, Figure 2; Practice Q5)
Calculation and skills
- I can calculate Φ_E = EA cos θ when the angle is given from the surface or from its normal. (Guide: Worked example 1; Practice Q1)
- I can calculate flux from field components using the dot product. (Guide: Worked example 1(b); Practice Q4)
- I can draw a surface edge-on with its area vector and mark the correct angle. (Guide: Figure 1)
- I can find the flux through each face of a box, with signs, and the net flux. (Practice Q5)
- I can set up ∫E·dA with strips on which E is constant, including strips whose length changes. (Guide: Worked example 2; Practice Q7)
Reasoning
- I can find the flux through a curved surface in a uniform field by closing it with a flat surface. (Guide: Worked example 3; Practice Q6)
- I can predict the factor by which flux changes when E, A or the angle changes. (Practice Q3)
- I can judge whether a quick estimate of flux is too large or too small for a non-uniform field. (Guide: Worked example 2; Practice Q7)
All ticked? Move on to Topic 8.6, Gauss’s Law, or return to the course roadmap.