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20.1 Magnetic Fields All magnets have two poles: N and S

20.1 Magnetic Fields All magnets have two poles: N and S Like poles repel and unlike poles attract. 20.1 Magnetic Fields. Geography & Magnetism Magnetic declination Dip angle. 20.1 Magnetic Fields Dynamo model. 20.1 Magnetic Fields

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20.1 Magnetic Fields All magnets have two poles: N and S

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  1. 20.1 Magnetic Fields • All magnets have two poles: N and S • Like poles repel and unlike poles attract APHY201

  2. 20.1 Magnetic Fields • Geography & Magnetism • Magnetic declination • Dip angle APHY201

  3. 20.1 Magnetic Fields • Dynamo model APHY201

  4. 20.1 Magnetic Fields • Dynamo model – field reversals, aurora, biomagnetism APHY201

  5. 20.1 Magnetic Fields APHY201

  6. 20.1 Magnetic Fields APHY201

  7. 20.2 Electric Currents produce Magnetic Fields • Hans Oersted (1820) APHY201

  8. 20.3 Force on Electric Currents in Magnetic Fields • The direction of the magnetic force is always perpendicular to both I and B. F = I l B sinθ (if B is uniform) APHY201

  9. 20.4 Force on Electric Charges in Magnetic Fields F = q v B sinθ APHY201

  10. 20.4 Force on Electric Charges in Magnetic Fields APHY201

  11. 20.5 Magnetic Field of a Long, Straight Wire • The magnetic field strength is if r << length of wire. r APHY201

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