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Magnetism and Matter
Physics · Chapter 9 · Units 3-4: Magnetic Effects of Current and Magnetism; Electromagnetic Induction and Alternating Currents
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Your path through this chapter
Visual lesson Beta
- Part 1: Bar magnets, magnetic dipoles and flux18 slides
- Part 2: Magnetic materials, electromagnets and the B–H loop19 slides
Flashcards Beta
30 cards for quick recall of key terms and facts.
Review the cards Step 3: Not startedPractice
71 board-style questions with instant checks: Numerical 19, Short answer 17, Multiple choice 16, Assertion and reason 7.
Practise Step 4: Not startedChapter test Free
Short and long chapter tests in board pattern, with results and analysis.
Step 5: Not started- Chapter test (long) — Magnetism and Matter · 40 marks · 100 min
- Chapter test (short) — Magnetism and Matter · 20 marks · 50 min
Topics 5
- Bar magnet as an equivalent solenoid; magnetic field lines as closed loops (no monopoles) compared with electric field lines
- Field of a magnetic dipole in end-on and broadside-on positions (formulae); torque on a magnetic dipole in a uniform field
- Magnetic flux and flux density; weber, tesla and gauss
- Diamagnetic, paramagnetic and ferromagnetic substances: magnetisation M, intensity H, susceptibility, relative permeability; Curie's law and Curie temperature
- Electromagnets and factors affecting their strength; choice of materials for permanent magnets, electromagnets and transformer cores; B-H loop, retentivity and coercivity