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 describe B as a vector field and name the three kinds of object it exerts forces on. (Guide: “What a magnetic field is”)
- I can explain why there are no magnetic monopoles and what happens when a magnet is cut in half. (Guide: “No monopoles: Gauss’s law for magnetism”)
- I can state Gauss’s law for magnetism, ∮B·dA = 0, and explain why it means field lines form closed loops. (Guide: “No monopoles”; Practice Q1)
- I can explain permanent and induced magnetism as the alignment of dipoles produced by moving electrons. (Guide: “Where magnetism comes from”; Practice Q5)
- I can tell ferromagnetic, paramagnetic and diamagnetic materials apart, with examples, and say what happens when the field is removed. (Guide: “How materials respond to a field”; Practice Q5)
- I can explain what permeability measures, why μ₀ is a constant and why a material’s μ is not. (Guide: “Magnetic permeability”; Practice Q2)
Calculation and skills
- I can draw the field lines of a bar magnet, inside and outside, with correct arrows. (Guide: Figure 1; Practice Q6)
- I can find the flux through a flat face in a uniform field, using only the component along the normal. (Guide: Worked example 1; Practice Q4)
- I can use ∮B·dA = 0 to find the flux through the last part of a closed surface, with the right sign. (Practice Q3, Q4)
- I can derive B_r = −(r/2) dB_z/dz for an axially symmetric field and evaluate it. (Guide: Worked example 2; Practice Q7)
Reasoning
- I can predict which way a compass points by combining the fields of several poles. (Practice Q6)
- I can describe Earth’s field as a dipole field and explain why the pole near the geographic North Pole is a magnetic south pole. (Guide: “Earth as a magnet”)
- I can explain why an unmagnetised iron object is attracted to either pole of a magnet. (Practice Q5)
All ticked? Move on to Topic 12.2, Magnetism and Moving Charges, or return to the course roadmap.