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

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APHY201 06/15/22 1 20.1 Magnetic Fields All magnets have two poles: N and S Like poles repel and unlike poles attract

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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 - PowerPoint PPT Presentation

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

Page 1: 20.1 Magnetic Fields All magnets have two poles: N and S

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

attract

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20.1 Magnetic Fields

Geography & Magnetism

Magnetic declination

Dip angle

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20.1 Magnetic Fields Dynamo model

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20.1 Magnetic Fields Dynamo model – field reversals, aurora,

biomagnetism

http://spaceweather.com/gallery/index.php?title=aurora&title2=lights
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20.1 Magnetic Fields

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20.1 Magnetic Fields

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20.2 Electric Currents produce Magnetic Fields Hans Oersted (1820)

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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)

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20.4 Force on Electric Charges in Magnetic Fields

F = q v B sinθ

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20.4 Force on Electric Charges in Magnetic Fields

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20.5 Magnetic Field of a Long, Straight Wire

The magnetic field strength is

if r << length of wire.

r

IB o

2

r


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