Magnetic Properties
Chapter Name : The Solid State |
Sub Topic Code : 102_12_01_12_01 |
Topic Name : Magnetic Properties |
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Sub Topic Name : Magnetic Properties |
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Introduction
The different kinds / categories of magnetism
Pre-Requisites:
Atom , electrons
Activity:
The refrigerator door has a magnet. You can observe. Try!! Verify that ferromagnetic substances are permanent magnets by using a magnet and finding out whether they show strong attraction or not.
Real Life Question:
“Why a piece of iron (iron nail) is attracted by a magnet and a copper wire is not?”
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Para magnetism Diamagnetism Ferromagnetism ant ferromagnetism ferrimagnetism | Weak magnetism (attraction) and temporary Weak repulsion due to paired electrons Very strong attraction and is permanent Domains oppositely oriented , cancels out the effect Weakly attracted , domains parallel and antiparallel in unequal numbers |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| pictures representing all categories of magnetism | Stick them on the favorite wall of your room |
Real life uses :
Credit cards carry account info on a magnetic strip Used to stick notes on refrigerator
Places to visit :
Anywhere or everywhere. Carry a magnet and see what things are attracted to it
Practical examples around us
| Examples | Explainations |
|---|---|
| Refrigerator door Iron nails | Has a magnet Attracted to a magnet |
What you learn in Theory:
Magnetic properties
What you learn in Practice:
What properties actually determine whether a substance is attracted by a magnet or not?