IP Physics Notes (Upper Secondary, Year 3-4): 14) Magnetism
Download printable cheat-sheet (CC-BY 4.0)30 Sep 2025, 00:00 Z
Join our Telegram study groupQ: What does IP Physics Notes (Upper Secondary, Year 3-4): 14) Magnetism cover?
A: Review magnetic materials, field-line patterns, magnetisation methods, and screening strategies for IP magnetism questions.
Quick recap -- Magnetism revolves around poles, field lines, and how materials respond. Distinguish soft vs hard magnets, master field sketches, and know how to magnetise or demagnetise safely.
Keep your practice loop tight via our IP Physics tuition hub—it links each topic here to quizzes, diagnostics, and WA-style problem sets.
Laws & Properties of Magnets
- Like poles repel, unlike poles attract; forces strongest near poles.
- Freely suspended magnet aligns roughly north-south (Earth behaves like a giant magnet: geographic north magnetic south).
- Magnetic materials: iron, steel, cobalt, nickel. Non-magnetic: copper, aluminium, plastic, wood.
Magnetic Materials: Soft vs Hard
| Type | Examples | Magnetisation | Uses |
| Soft magnetic | Iron, soft iron alloys | Easy to magnetise/demagnetise | Electromagnets, transformer cores |
| Hard magnetic | Steel, AlNiCo | Difficult to magnetise but retains magnetism | Permanent magnets |
Magnetisation & Demagnetisation
- Magnetise:
- Stroking with a permanent magnet (in one direction).
- Placing in a solenoid carrying direct current (define north/south by right-hand grip).
