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Chapter 29:
Magnetic Fields Due to Currents
Electromagnetism.
Calculating the magnetic field due to a
current.
Magnetic field due to a current in a long
straight wire.
Magnetic field due to a current in a circular
arc of wire.
Force between two parallel currents.
October 13, 2009
Ch. 29:
Magnetic Fields Due to Currents  Part A
1
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View Full Document Electromagnetism
Electromagnetism is the combined study of electric and
magnetic effects.
moving charged particle produces a magnetic field
A moving charged particle produces a magnetic field
around itself.
A current of moving charged particles produces a
gg
p
p
magnetic field around the current.
Gian Domenico Romagnosi (17611835), an Italian
philosopher, described electric current from a voltaic
pile (an early type of battery) deflecting a magnetic
needle in an Italian newspaper in 1802.
Hans Christian Oersted (17771851), a Danish physicist
and chemist, noticed that a compass needle deflected
om the magnetic north when electric current from a
October 13, 2009
Ch. 29:
Magnetic Fields Due to Currents  Part A
2
from the magnetic north when electric current from a
battery was switched on and off, 1820.
Electromagnetism
AndreMarie Ampere (17751836), a French physicist,
extended Oersted’s work, one week after hearing about
it, and developed the mathematical formula for the
magnetic forces between currentcarrying wires.
Michael Faraday (17911867), a British physicist and
emist discovered electromagnetic induction
chemist, discovered electromagnetic induction –
Faraday’s law, mutual induction, diamagnetism, laws of
electrolysis, benzene, invented EM rotary devices,.
..
Named after him:
Faraday’s constant, the unit for
capacitance Farad.
mes Clerk Maxwell (1831
879) a Scottish
James Clerk Maxwell (18311879), a Scottish
theoretical physicist and mathematician; Maxwell’s
equations – unified theory of electricity (1873),
October 13, 2009
Ch. 29:
Magnetic Fields Due to Currents  Part A
3
magnetism and EM waves, MaxwellBoltzmann
distribution, first color photograph.
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View Full Document Calculating the Magnetic Field Due to a Current
Determine the magnetic field due to the current in
a very small section of currentcarrying wire.
ire of arbitrary shape carrying
Wire of arbitrary shape, carrying
current
i
.
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This note was uploaded on 03/12/2010 for the course PHY PHY taught by Professor Mueller during the Spring '09 term at University of Florida.
 Spring '09
 MUELLER

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