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Magnetism. Magnetism is the force of attraction or repulsion of a magnetic material due to the arrangement of its atoms, particularly its electrons. Lik e poles will repel, opposite poles will attract. Magnetic field lines describe the structure of magnetic fields in three dimensions.

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Presentation Transcript
magnetism
Magnetism
  • Magnetism is the force of attraction or repulsion of a magnetic material due to the arrangement of its atoms, particularly its electrons.
    • Like poles will repel, opposite poles will attract.
  • Magnetic field lines describe the structure of magnetic fields in three dimensions.
    • At the poles of a magnet, the magnetic field lines are closer together.
    • The strength of the magnetic field is greater where the lines are closer together and weaker where they are farther apart.
magnetic domains
Magnetic Domains
  • Moving electrons produce magnetic fields.
    • In most materials, these magnetic fields cancel one another and neutralize the overall magnetic effect.
    • In other materials, such as iron, cobalt, and nickel, the atoms behave as tiny magnets because of certain orientations of the electrons inside the atom.
    • These atoms are grouped in a tiny region called the magnetic domain.
the earth is a magnet
The Earth is a Magnet
  • It exerts a magnetic forces and is surrounded by a magnetic field that is strongest near the North and South magnetic poles.
  • The Earth’s magnetosphere extends far out into space and is constantly bombarded by magnetic particles from the sun – “solar wind”.
  • How to remove magnetism
    • Drop the magnet
    • Heat the magnet
      • The Curie point is the temperature at which the magnetic properties of a substance are removed and is different for each substance.
magnetic fields produced by conductors
Magnetic Fields Produced by Conductors

And how to switch on and off the strangely attractiveness

oersted s discovery
Oersted’s Discovery

In 1819, the Danish physicist Hans Christian Oersted (1777-1851) discovered the connection between electricity and magnetism by accident while lecturing at the University of Copenhagen. He noticed that a compass needle placed closely to a current carrying wire would take up a position nearly perpendicular to the direction of the current.

magnetic field of a straight conductor
Magnetic Field of a Straight Conductor
  • The magnetic field lines for a straight conductor are concentric circles around the conductor.
electromagnets
Electromagnets
  • A device that exerts a magnetic force using electricity.
  • The magnetic field around a straight conductor can be intensified by bending the wire into a loop.
coil or solenoid
Coil or Solenoid
  • The magnetic field can be further intensified by combining the effects of a large number of loops would close together to form a coil, or solenoid.
type of core material
Type of Core Material
  • The core material becomes an induced magnet, as its atomic dipoles align with the magnetic field of the coil. The core itself becomes an induced magnet.
  • The factor by which a core material increases the magnetic field strength is called the material’s relative magnetic permeability (K).