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MAGNETS.pptx

  1. 1. MAGNETS SHAPES AND FIELDS Presented by :2020phy5 Presented to :DR SAIMA
  2. 2. Why Magnet is Magnet? Magnetism is the force exerted by magnets when they attract or repel each other. • Magnetism is caused by the motion of electric charges. Every substance is made up of tiny units called atoms. Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet. • In most substances, equal numbers of electrons spin in opposite directions, which cancels out their magnetism. That is why materials such as cloth or paper are said to be weakly magnetic. In substances such as iron, cobalt, and nickel, most of the electrons spin in the same direction. This makes the atoms in these substances strongly magnetic
  3. 3. What is Magnet? An object which is capable of producing magnetic field. • Types of magnets w.r.t field • Permanent magnets(cobalt) • Temporary magnets 1. Diamagnetic 2. Paramagnetic 3. Ferromagnetic • Electromagnets
  4. 4. Behaviour of Different Materials
  5. 5. TYPES OF MAGNETS w.r.t SHAPE • Bar Magnets. • Horseshoe Magnets. • Disc Magnets. • Sphere Magnets. • Cylinder Magnets. • Ring Magnets.
  6. 6. SHAPES:
  7. 7. Field of Bar Magnet
  8. 8. Field of Horseshoe Magnet
  9. 9. Field of Disc Magnet
  10. 10. Field of Sphere Magnet
  11. 11. Field of Cylinder Magnet
  12. 12. Field of Ring Magnet

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