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4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield

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Text of 4.3.1 Magnetic Fields and Electromagnetic Induction The Earth’s Shield

  • 4.3.1 Magnetic Fields and Electromagnetic InductionThe Earths Shield

  • All charges produce ELECTRIC FIELDSMoving charges produce MAGNETIC FIELDSPERPENDICULAR to the motion of the charge

    Magnetic field linesElectromagnetic Induction

  • Making a MagnetMagnetism is a FIELD FORCENo contact required

    All atoms have some natural of magnetismThree strongly magnetic elementsIRON, NICKEL, COBALT

  • Magnets produce magnetic fields Moving magnets produce ELECTRIC FIELDSPERPENDICULAR to motion of the magnetThis causes ELECTRICAL CURRENT to flowElectromagnetic Induction

  • Magnetic Field LinesRules for field line directionsOutside magnet NORTH TO SOUTHInside magnet SOUTH TO NORTH

  • Magnetic Field Maps

  • Magnetic Field Maps

  • Magnetic Field Maps

  • N S Determine the direction of the magnetic field lines at each point. Where is the field strongest?Example #1Field is strongest at point C.

  • Determine the direction of the magnetic field lines at each point. Where is the field strongest?Example #2Field is strongest at point F.

  • The needle of a compass is a small MAGNETThe north pole of a compass needle is marked with a small N or a prominent color points toward magnetic SOUTH poles.Compass

  • Determine the direction in which the compass will point.Example #3

  • Convection currents in the outer iron core produce the Earths magnetic fieldThe geographic NORTH pole of the Earth acts like the SOUTH pole of a magnet!Earths Magnetic Field

  • The Magnetosphere

  • End of 4.3.1 PRACTICE

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