APHY201 06/15/22 1 20.1 Magnetic Fields All magnets have two poles: N and S Like poles repel and unlike poles attract
20.1 Magnetic Fields All magnets have two poles: N and S
Jan 04, 2016
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
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
APHY20104/20/23 1
20.1 Magnetic Fields All magnets have two poles: N and S Like poles repel and unlike poles
attract
APHY20104/20/23 2
20.1 Magnetic Fields
Geography & Magnetism
Magnetic declination
Dip angle
APHY20104/20/23 3
20.1 Magnetic Fields Dynamo model
APHY20104/20/23 4
20.1 Magnetic Fields Dynamo model – field reversals, aurora,
biomagnetism
APHY20104/20/23 5
20.1 Magnetic Fields
APHY20104/20/23 6
20.1 Magnetic Fields
APHY20104/20/23 7
20.2 Electric Currents produce Magnetic Fields Hans Oersted (1820)
APHY20104/20/23 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)
APHY20104/20/23 9
20.4 Force on Electric Charges in Magnetic Fields
F = q v B sinθ
APHY20104/20/23 10
20.4 Force on Electric Charges in Magnetic Fields
APHY20104/20/23 11
20.5 Magnetic Field of a Long, Straight Wire
The magnetic field strength is
if r << length of wire.
r
IB o
2
r
Related Documents
