Magnetism

anna2528
Mind Map by , created over 6 years ago

Other Physics Mind Map on Magnetism, created by anna2528 on 04/19/2013.

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anna2528
Created by anna2528 over 6 years ago
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Magnetism
1 Poles
1.1 All magnets have north and south poles
1.2 Opposite poles attract and like poles repel

Annotations:

  • https://www.google.co.uk/search?safe=off&q=breaking+a+magnet&bav=on.2,or.r_cp.r_qf.&bvm=bv.45512109,d.d2k&biw=1366&bih=643&wrapid=tlif136644468433410&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=lkpyUbiLIYHU0QWo64C4CA#um=1&safe=off&hl=en&tbm=isch&sa=1&q=magnets+attracting+and+repelling&oq=attracting+and+repell&gs_l=img.3.0.0i5l2j0i24l2.99238.104072.0.106444.21.17.0.4.4.0.259.2079.6j9j2.17.0...0.0...1c.1.9.img.STYlTfF0UvQ&bav=on.2,or.r_cp.r_qf.&bvm=bv.45512109,d.d2k&fp=f0fe323487b2251a&biw=1366&bih=643&imgrc=j1n-1hYavWDb9M%3A%3BAEG0dZ3jFys__M%3Bhttp%253A%252F%252Fstartswithabang.com%252Fwp-content%252Fuploads%252F2009%252F03%252Fnewmagnet.jpg%3Bhttp%253A%252F%252Fstartswithabang.com%252F%253Fp%253D1643%3B640%3B480
2 Changing Magnets
2.1 Breaking
2.1.1 Breaking a magnet makes two magnets. They will both have a north and south pole but they will just be weaker than when they were together

Annotations:

  • https://www.google.co.uk/search?safe=off&q=breaking+a+magnet&bav=on.2,or.r_cp.r_qf.&bvm=bv.45512109,d.d2k&biw=1366&bih=643&wrapid=tlif136644468433410&um=1&ie=UTF-8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=lkpyUbiLIYHU0QWo64C4CA#imgrc=czxX5hiLWCRldM%3A%3BM3zZaP_Wrie65M%3Bhttp%253A%252F%252Fwww.splung.com%252Ffields%252Fimages%252Fbarscut.png%3Bhttp%253A%252F%252Fwww.splung.com%252Fcontent%252Fsid%252F3%252Fpage%252Fmagnetism%3B247%3B163
2.1.1.1 This will keep on happening every time you break it.
2.2 Magnetic Materials
2.2.1 When a magnetic material is close to a magnet it becomes a magnet itself. This means a magnet can turn a magnetic item any way round.

Annotations:

  • In the link below, the paperclips have turned into a magnet. If the magnet's side facing the paperclips were north, the paperclips will automatically turn to south. https://www.google.co.uk/search?safe=off&hl=en&q=magnetic+material+into+a+magnet&bav=on.2,or.r_cp.r_qf.&bvm=bv.45512109,d.d2k&biw=1366&bih=643&wrapid=tlif136644489505710&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=bUtyUbamLI-X0QWF-4CwBg#um=1&safe=off&hl=en&tbm=isch&q=paper+clip+and+magnet&spell=1&sa=X&ei=m0tyUcGJOOaW0QXGq4D4DA&ved=0CFAQBSgA&bav=on.2,or.r_cp.r_qf.&bvm=bv.45512109,d.d2k&fp=f0fe323487b2251a&biw=1366&bih=643&imgrc=Q6btwRFv9uVI7M%3A%3B3Z4St_wxA2ExeM%3Bhttp%253A%252F%252Fcontent.mycutegraphics.com%252Fgraphics%252Fscience%252Fmagnet-paper-clips.png%3Bhttp%253A%252F%252Fwww.mycutegraphics.com%252Fgraphics%252Fscience%252Fmagnet-with-paper-clips.html%3B450%3B421
2.2.1.1 This means it has an 'Induced Magnetism'

Annotations:

  • http://www.le.ac.uk/se/centres/sci/selfstudy/mam6.htm Explains Induced Magnetism
3 Types of Metal Found In Magnets
3.1 Soft Magnetic Materials
3.1.1 Pure iron is a soft magnetic material
3.1.1.1 It is easy to magnetise but loses its magnetism easily
3.1.1.2 Iron is used in a electric bell. This is so when it hits the hammer, it looses its magnetism instantly as it is not connected to the magnet.
3.1.1.2.1 When it reconnects it regains its magnetism. This process creates the ringing noise.
3.2 Hard Magnetic Materials
3.2.1 Steel is an example of a hard magnetic material
3.2.1.1 It is harder than iron to magnetise but it keeps its magnetism much longer.
4 Magnetic Fields
4.1 Magnetic fields are in the shape of an 8 around a magnet with lines coming out of the middles

Annotations:

  • https://www.google.co.uk/search?safe=off&hl=en&q=magnetic+fields&bav=on.2,or.r_cp.r_qf.&biw=1366&bih=643&wrapid=tlif136639968922210&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=2ZtxUebpIMib0AXtloGQDA#imgrc=OXPuZBFnVSiSWM%3A%3BBUIRp_frWue46M%3Bhttp%253A%252F%252Fwww.tutorhelpdesk.com%252FUserFiles%252Flines%252520of%252520magnetic%252520flux%252C1.jpg%3Bhttp%253A%252F%252Fwww.physicsforums.com%252Fshowthread.php%253Ft%253D673315%3B430%3B310
5 Electromagnets
5.1 How is it made?
5.1.1 To make an electromagnet, you need to have an electric current going through a wire.
5.1.1.1 This would already be an electromagnet but if you add an iron nail to it, it will make it even stronger
5.1.2 They are usually made of iron so it will loose its magnetism quickly. Steel would keep it as a magnet for much longer.

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