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 that a moving charge makes a magnetic field, and describe how the field depends on the charge’s speed and the distance to the point. (Guide: “Moving charges make magnetic fields”)
- I can find the direction of the field a moving charge makes at a point, and say where that field is largest and where it is zero. (Practice Q3)
- I can explain why magnetic forces are interactions between moving charges. (Guide: “Magnetic forces between moving charges”)
- I can explain why the magnetic force does no work and cannot change a charge’s speed. (Guide: “Circular motion”; Practice Q5d)
Calculation and skills
- I can calculate F = |q|vB sin θ for angles of 0°, 90° and 180°, and describe the force qualitatively at other angles. (Guide: “The force on a moving charge”; Practice Q1)
- I can find the direction of the magnetic force with the right-hand rule, and reverse it for a negative charge. (Guide: Worked example 1; Practice Q2)
- I can derive r = mv/(|q|B) and use it to find radii and orbit times. (Guide: “Circular motion”; Practice Q5)
- I can predict the factor by which r changes when v, B, q or m changes. (Practice Q4)
Reasoning
- I can treat electric and magnetic forces on one charge separately and find the speed at which they balance. (Guide: Worked example 2; Practice Q6)
- I can explain the Hall effect, decide which edge is at the higher potential, and use ΔV_H = vBw. (Guide: Worked example 3; Practice Q7)
- I can use the sign of a Hall potential difference to decide the sign of the charge carriers. (Guide: Worked example 3)
- I can justify a force direction in words, stating v, B and the result, not just “by the right-hand rule”. (Guide: “Common misconceptions”)
All ticked? Move on to Topic 12.3, Magnetism and Current-Carrying Wires, or return to the course roadmap.