Magnets and Electromagnets

  • Created by: NlleA
  • Created on: 26-09-18 17:32
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  • Magnets & Electro-magnets
    • Hard & soft magnetism
      • Pure iron's a soft magnetic material
        • Easy to magnetise but loses magnetism quickly
      • Steel's a hard magnetic material
        • Harder to magnetise but keeps magnetism
    • Domains
      • Heat from a room's sufficient to give domain's energy; this destroys orderly lines, magnetic field will disappear
        • Way to lose domain energy/ alignment is to hit it (or similar)
      • Impurity atoms make it difficult to magnetise AlNiCo magnets but also locks domains in position once aligned.
    • Current running through a wire
      • A current running through wire will produce magnetic field around wire
        • Magnetic field around wire depends on strength of current
    • Solenoids (a coiled wire)
      • Magnetic field will increase if you turn a straight wire into solenoid
        • Field inside solenoid is strong and uniform
      • Field around a solenoid is largely the same as a bar magnet
      • Ways to make a solenoid stronger:
        • Add an iron core in middle of solenoid
        • Increase current in electromagnet
        • Increase coils of wire
        • Turn straight wire into a solenoid
    • Ways to make a solenoid stronger:
      • Add an iron core in middle of solenoid
      • Increase current in electromagnet
      • Increase coils of wire
      • Turn straight wire into a solenoid

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