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

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Presentation transcript:

20.1 Magnetic Fields All magnets have two poles: N and S Like poles repel and unlike poles attract 4/27/2017 APHY201

20.1 Magnetic Fields Geography & Magnetism Magnetic declination Dip angle 4/27/2017 APHY201

20.1 Magnetic Fields Dynamo model 4/27/2017 APHY201

20.1 Magnetic Fields Dynamo model – field reversals, aurora, biomagnetism 4/27/2017 APHY201

20.1 Magnetic Fields 4/27/2017 APHY201

20.1 Magnetic Fields 4/27/2017 APHY201

20.2 Electric Currents produce Magnetic Fields Hans Oersted (1820) 4/27/2017 APHY201

F = I l B sinθ (if B is uniform) 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) 4/27/2017 APHY201

20.4 Force on Electric Charges in Magnetic Fields F = q v B sinθ 4/27/2017 APHY201

20.4 Force on Electric Charges in Magnetic Fields 4/27/2017 APHY201

20.5 Magnetic Field of a Long, Straight Wire The magnetic field strength is if r << length of wire. r 4/27/2017 APHY201