Unit 4 Day 1 – Magnetic Fields Produced by Electric Currents Magnets Magnetic Fields Surrounding Magnets Magnetic Fields Produced by Electric Currents

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  • Slide 1
  • Unit 4 Day 1 Magnetic Fields Produced by Electric Currents Magnets Magnetic Fields Surrounding Magnets Magnetic Fields Produced by Electric Currents
  • Slide 2
  • Magnets Certain materials exhibit ferromagnetic properties, ie: they are surrounded by a magnetic field Magnetic materials are: iron, nickel, cobalt, & gadolinium (and their alloys) Magnets consists of two ends called poles, referred to a north and south The magnetic field surrounding a magnet forms a closed loop through the magnet, in the direction from north to south
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  • Magnetic Fields Surrounding Magnets A compass is used to determine the direction of a magnetic field. A compass needle always points away from the north magnetic pole
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  • Magnetic Field Surrounding the Earth The earth consists of a magnetic field. Note: The earths north-magnetic pole is at the south geographic pole
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  • Magnetic Field Between Two Magnetic Poles Magnetic fields between two wide poles of a magnet are nearly uniform with only slight fringing at the edges Magnets always consists of two poles Magnetic mono-poles do not exist in nature and have never been observed
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  • Magnetic Fields produced by Electric Currents In 1820 Hans Christian Oersted found that a compass placed close to a current carrying conductor will deflect the needle
  • Slide 7
  • Magnetic Fields produced by Electric Currents An electric current produces a magnetic field around a wire. The direction of the field follows the Right hand Rule #1

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