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Presentation On Magnetism

Home > PowerPoint Slides > Presentation On Magnetism
Published in: Physics
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#IGCSE #physics #0625 #magnetism

Nicole T / Kuching

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Teaches: English, Mathematics, Science, Bahasa Melayu, Chemistry, Physics, Additional Math, Modern Maths, Mandarin, Bahasa Malaysia

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  1. coss PHYSICS - Simple phenomena of magnetism
  2. Core •Describe the forces between magnets, and between magnets and magnetic materials • Give an account of induced magnetism • Distinguish between magnetic and non- magnetic materials • Describe methods of magnetisation, to include stroking with a magnet, use of d.c. in a coil and hammering in a magnetic field • Draw the pattern of magnetic field lines around a bar magnet • Describe an experiment to identify the pattern of magnetic field lines, including the direction • Distinguish between the magnetic properties of soft iron and steel • Distinguish between the design and use of permanent magnets and electromagnets LEARNING OBJECTIVES Supplement Explain that magnetic forces are due to interactions between magnetic fields • Describe methods Of demagnetisation, to include hammering, heating and use Of a.C. in a coil
  3. Magnets Properties Have magnetic fields around them. Attracted? „ or not?
  4. Magnets Properties Have magnetic fields around them. Have two opposite poles (N & S) - like poles repel, unlike poles attract. Attracted? may be?
  5. Magnets Properties Have magnetic fields around them. Have two opposite poles (N & S) - like poles repel, unlike poles attract. Attracted? possibly? Exert little or no force on a non-magnetic material.
  6. Magnets Properties Have magnetic fields around them. Attract magnetic materials by inducing magnetism in them. Iron Have two opposite poles (N & S) - like poles repel, unlike poles attract. Steel Attracted? hopefully? Exert little or no force on a non-magnetic material.
  7. Magnets Properties Have magnetic fields around them. Have two opposite poles (N & S) - like poles repel, unlike poles attract. Attracted? mmmm? Exert little or no force on a non-magnetic material. Attract magnetic materials by inducing magnetism in them. s Poles induced in both iron and steel.
  8. Magnets Properties Have magnetic fields around them. Have two opposite poles (N & S) - like poles repel, unlike poles attract. Attract magnetic materials by inducing magnetism in them. Iron loses Attracted? YES!!! Exert little or no force on a non-magnetic material. s Steel retains magnetism magnetism — it was — it became a permanent only a temporary magnet magnet
  9. Magnets - make your own! How strong is it? Not very. s Placing a piece of steel near a magnet makes it permanently magnetised, but its magnetism is usually weak.
  10. Magnets - make your own! How strong is it? D Getting stronger. Wide sweep away from the steel Induced poles s The magnet can be magnetized more strongly by stroking it with one end of a magnet
  11. Magnets - make your own! How strong is it? Strongest! Coil The best way of magnetizing is to place the steel bar in a long coil of wire and pass a large, direct (one way) current through the coil. The coil has a magnetic effect which magnetizes the steel. Steel
  12. Magnets - how do they work? Just what is happening inside the magnet to make it magnetic?
  13. Magnets - how do they work? We need to look closely at what is happening to the particles (electrons) inside the magnet. Just what is happening inside the magnet to make it magnetic?
  14. Magnets - how do they work? We need to look closely at what Just what is happening inside the magnet to make it magnetic? is happening to the particles (electrons) inside the magnet. In an unmagnetized material, the tiny electrons, or atomic magnets point in random directions.
  15. Magnets - how do they work? Just what is happening inside the magnet to make it magnetic? We need to look closely at what is happening to the particles (electrons) inside the magnet. When the material becomes magnetized, more and more of the tiny atomic magnets line up with each other. They act as one BIG magnet.
  16. Magnets - how do they work? Just what is happening inside the magnet to make it magnetic? We need to look closely at what is happening to the particles (electrons) inside the magnet. If a magnet is hit with a hammer, the tiny atomic magnets get thrown out of line again, so the material becomes demagnetised.
  17. Magnets - how do they work? We need to look closely at what Just what is happening inside the magnet to make it magnetic? is happening to the particles (electrons) inside the magnet. If a magnet is hit with a hammer, the tiny atomic magnets get thrown out of line again, so the material becomes demagnetised. A magnet will also become demagnetized if heated to high temperature.
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  19. Magnetic and non-magnetic Magnetic material - can be magnetized, and is attracted to magnets. Strongly magnetic materials contain iron, nickel or cobalt (eg. Steel is mainly iron).
  20. Magnetic and non-magnetic Magnetic material - can be magnetized, and is attracted to magnets. Strongly magnetic materials contain iron, nickel or cobalt (eg. Steel is mainly iron). Ferromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. Used for permanent magnets.
  21. Magnetic and non-magnetic Magnetic material - can be magnetized, and is attracted to magnets. Strongly magnetic materials contain iron, nickel or cobalt (eg. Steel is mainly iron). Ferromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. Used for permanent magnets. Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is temporary. Used in electromaqnets and transformers.
  22. Magnetic and non-magnetic Magnetic material - can be magnetized, and is attracted to magnets. Strongly magnetic materials contain iron, nickel or cobalt (eg. Steel is mainly iron). Non-magnetic materials. Metals (brass, copper, zinc, tin and aluminium); Ferromagnets non-metals. Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. Used for permanent magnets. Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is temporary. Used in electromaqnets and transformers.
  23. Magnetic fields
  24. Magnetic fields Iron filings sprinkled around a magnet Magnetic field lines around the magnet
  25. Magnetic fields Iron filings sprinkled around a magnet Magnetic field lines around the magnet ield lines run from the north pole (N) to the south pole (S). The magnetic field is strongest where the field lines are closer t ether.
  26. Magnetic fields Using a plotting compass to find the field lines. s
  27. Magnetic fields Using a plotting compass to find the field lines. s
  28. Magnetic fields Using a plotting compass to find the field lines. s
  29. Magnetic fields Using a plotting compass to find the field lines.
  30. Magnetic fields Using a plotting compass to find the field lines.
  31. Magnetic fields Using a plotting compass to find the field lines.
  32. Magnetic fields Using a plotting compass to find the field lines. s
  33. Magnetic fields Using a plotting compass to find the field lines. http://www.physbot.co.uk/magnetic-fields-and-induction.html s
  34. Magnetic fields Interactions between magentic fields unlike poies are placed near When each other, their magnetic fields combine to produce a single field of almost uniform stren h. http://www.homofaciens.de/technics•magnetic•field•energv_en_navlon.htm
  35. Magnetic fields Interactions between magentic fields en un 1 e po es are p ace n CdCh other, their magnetic fields ine to produce a si le fi ost uniform strength. http://www.homofaciens.de/technics•magnetic•field•energv_en_navlon.htm Neutral point en plac near Other, their magnetic fields cancel each other, and there is a neutral point where the combined field strength is zero.
  36. The Earth's magnetic field The Earth's magnetic field is like that around a very large, but very weak, bar magnet.
  37. The Earth's magnetic field The Earth's magnetic field is like that around a very large, but very weak, bar magnet. A compass 'north' end points north. But a north pole is always attracted to a south pole, so the Earth's magnetic south pole must actually be in the north.
  38. The Earth's magnetic field The Earth's magnetic field is like that around a very large, but very weak, bar magnet. A compass 'north' end points north. But a north pole is always attracted to a south pole, so the Earth's magnetic south pole must actually be in the north. The Earth's magnetic north is actually over 1200km away from the true geographic north pole.
  39. The Earth's magnetic field Over a period of time the Earth's magnetic pole will 'flip'. The Earth's magnetic field is like that around a very large, but very weak, bar magnet. A compass 'north' end points north. But a north pole is always attracted to a south pole, so the Earth's magnetic south pole must actually be in the north. The Earth's magnetic north is actually over 1200km away from the true geographic north pole.
  40. The Earth's magnetic field Over a period of time the Earth's magnetic pole will 'flip'. In the last 10 million years, there have been, on average, 4 or 5 'flips' per million years. The Earth's magnetic field is like that around a very large, but very weak, bar magnet. A compass 'north' end points north. But a north pole is always attracted to a south pole, so the Earth's magnetic south pole must actually be in the north. The Earth's magnetic north is actually over 1200km away from the true geographic north pole.
  41. Electromagnets Distinguis etween the design and use Of permanent magnets and electromagnets
  42. Electromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. used for permanent Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is tempecgcy. used in electromagnets and transformers. Distinguis etween the design and use Of permanent magnets and electromagnets Unlike bar magnets, which are permanent magnets, the ,magnetism of electromagnets an be turned on and off.
  43. Electromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. used for permanent Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is tempecgcy. used in electromagnets and transformers. Distinguis etween the design and use Of permanent magnets and electromagnets Unlike bar magnets, which are permanent magnets, the ,magnetism of electromagnets an be turned on and off. ermanen ma ne uses: Needles of compasses. Fridge door seals holding the doors closed. Loudspeakers and icro hone
  44. Electromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. used for permanent Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is tempecgcy. used in electromagnets and transformers. Distinguis etween the design and use Of permanent magnets and electromagnets switch coil battery Unlike bar magnets, which are permanent magnets, the ,magnetism of electromagnets an be turned on and off. Soft iron core ermanen ma ne uses: Needles of compasses. Fridge door seals holding the doors closed. Loudspeakers and icro hone When a current flows through the coil it produces a magnetic field. This field is temporary and is lost when the current is switched off.
  45. Electromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. used for permanent Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is tempecgcy. used in electromagnets and transformers. Distinguis etween the design and use Of permanent magnets and electromagnets switch coil battery Unlike bar magnets, which are permanent magnets, the ,magnetism of electromagnets an be turned on and off. ermanen ma ne uses: Needles of compasses. Fridge door seals holding the doors closed. Loudspeakers and icro hone When a current flows through the coil it produces a magnetic field. This field is temporary and is lost when the current is switched off. Soft iron core Strength increased by: Increasing the current Increasing number of turns
  46. Electromagnets Hard magnetic materials, eg. Steel, alloys (Alcomax, Magnadur). Difficult to magnetise, but do not lose their magnetism. used for permanent Soft magnetic materials, eg. Iron, Mumetal. Relatively easy to magnetise, but magnetism is tempecgcy. used in electromagnets and transformers. Distinguis etween the design and use Of permanent magnets and electromagnets switch coil battery Unlike bar magnets, which are permanent magnets, the ,magnetism of electromagnets an be turned on and off. ermanen ma ne uses: Needles of compasses. Fridge door seals holding the doors closed. Loudspeakers and icro hone When a current flows through the coil it produces a magnetic field. This field is temporary and is lost when the current is switched off. Soft iron core Strength increased by: Increasing the current Increasing number of turns Uses: scrapyard electromagnets, circuit breakers, relays, electric bells.
  47. Core •Describe the forces between magnets, and between magnets and magnetic materials • Give an account of induced magnetism • Distinguish between magnetic and non- magnetic materials • Describe methods of magnetisation, to include stroking with a magnet, use of d.c. in a coil and hammering in a magnetic field • Draw the pattern of magnetic field lines around a bar magnet • Describe an experiment to identify the pattern of magnetic field lines, including the direction • Distinguish between the magnetic properties of soft iron and steel • Distinguish between the design and use of permanent magnets and electromagnets LEARNING OBJECTIVES Supplement Explain that magnetic forces are due to interactions between magnetic fields • Describe methods Of demagnetisation, to include hammering, heating and use Of a.C. in a coil
  48. coss PHYSICS - Simple phenomena of magnetism

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