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Magnetism

Magnetism. What is Magnetism?. Magnetism is the attraction of a magnet to another object. What are Magnetic Poles?. Magnets have two ends, called magnetic poles . Magnetism is strongest at the poles of a magnet. S. N. Magnetic Poles. Magnetic poles that are alike repel each other .

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Magnetism

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  1. Magnetism

  2. What is Magnetism? • Magnetism is the attraction of a magnet to another object.

  3. What are Magnetic Poles? • Magnets have two ends, called magnetic poles. • Magnetism is strongest at the poles of a magnet.

  4. S N

  5. Magnetic Poles • Magnetic poles that are alike repel each other. • North repels North • South repels South • Poles that are not alike attract each other • North attracts South • South attracts North

  6. What is a Magnetic Field? • The magnetic force exerted in the region around the magnet is the magnetic field. • This allows magnets to interact without touching.

  7. What are Magnetic Field Lines? • Magnetic Field Lines spread out from one pole, curve around the magnet, and return to the other pole.

  8. S N

  9. What do atoms have to do with it? • All atoms have magnetic fields because of the charged particles inside. • Most atoms’ magnetic fields point in random directions, so they all cancel each other out.

  10. What do atoms have to do with it? • In magnetized material, all or most of the magnetic fields are arranged in the same direction. • A material that keeps its magnetism is called a permanent magnet.

  11. What do Electric Currentshave to do with Magnets? • An electric current produces a magnetic field. • The direction of the current determines the direction of the magnetic field.

  12. What are the magnetic properties of the Earth? • The Earth has an immense magnetic field around it called the magnetosphere.

  13. What is an Electromagnet • An Electromagnet is a strong magnet that can be turned on and off. • It consists of a current-carrying wire wrapped around an iron core.

  14. Characteristics of Electromagnets • Strength depends on the number of coils and the size of the iron core. • The greater the number of turns the coil has the stronger the magnet will be. • The closer the coils are the stronger the magnet will be.

  15. Motors and Generators • Electric Motor – a device that changes electric current into mechanical energy. • Generator – a device that changes mechanical energy into electrical current.

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