Difference between revisions of "Permanent Magnet"
(Created page with "==Key Stage 3== ===Meaning=== A '''permanent magnet''' is an object with its own magnetic field that remains there even when there are no other external...") |
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: A [[Bar Magnet|bar magnet]] is a '''permanent magnet'''. | : A [[Bar Magnet|bar magnet]] is a '''permanent magnet'''. | ||
: '''Permanent magnets''' are used in a electrical [[D.C. Motor|motor]]s. | : '''Permanent magnets''' are used in a electrical [[D.C. Motor|motor]]s. | ||
| + | : A [[magnet]] is made of several small [[Magnetic Domain|magnetic domains]] which are regions in the [[magnet]] which act as smaller [[magnet]]s. In a '''permanent magnet''' these [[Magnetic Domain|magnetic domains]] are fixed in place and need [[energy]] to change their [[magnet]]ic direction. | ||
: A '''permanent magnet''' can only lose its [[Magnetic Field|magnetic field]] under certain conditions: | : A '''permanent magnet''' can only lose its [[Magnetic Field|magnetic field]] under certain conditions: | ||
*When it is struck with a sudden [[force]]. | *When it is struck with a sudden [[force]]. | ||
*When it is [[heated]]. | *When it is [[heated]]. | ||
*When an extremely strong external [[Magnetic Field|magnetic field]] is applied. | *When an extremely strong external [[Magnetic Field|magnetic field]] is applied. | ||
| + | |||
| + | {| class="wikitable" | ||
| + | |- | ||
| + | |[[File:MagneticDomainAligned.png|center|300px]] | ||
| + | |[[File:MagneticDomainUnaligned.png|center|300px]] | ||
| + | |- | ||
| + | | style="height:20px; width:200px; text-align:center;" |When [[Magnetic Domain|magnetic domains]] are aligned the [[object]] has an external [[Magnetic Field|magnetic field]] so it acts like a [[magnet]]. | ||
| + | | style="height:20px; width:200px; text-align:center;" |When the [[Magnetic Domain|magnetic domains]] are not aligned there is no external [[Magnetic Field|magnetic field]] because the effect of the [[Magnetic Domain|magnetic domains]] cancels out. | ||
| + | |} | ||
Revision as of 10:14, 4 March 2019
Contents
Key Stage 3
Meaning
A permanent magnet is an object with its own magnetic field that remains there even when there are no other external magnetic fields.
About Permanent Magnets
- A bar magnet is a permanent magnet.
- Permanent magnets are used in a electrical motors.
Key Stage 4
Meaning
A permanent magnet is an object with its own magnetic field that remains there even when there are no other external magnetic fields.
About Permanent Magnets
- A bar magnet is a permanent magnet.
- Permanent magnets are used in a electrical motors.
- A magnet is made of several small magnetic domains which are regions in the magnet which act as smaller magnets. In a permanent magnet these magnetic domains are fixed in place and need energy to change their magnetic direction.
- A permanent magnet can only lose its magnetic field under certain conditions:
- When it is struck with a sudden force.
- When it is heated.
- When an extremely strong external magnetic field is applied.
| When magnetic domains are aligned the object has an external magnetic field so it acts like a magnet. | When the magnetic domains are not aligned there is no external magnetic field because the effect of the magnetic domains cancels out. |
