Kontakt

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demo
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EMO10

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wstep do magnetostatyki
Slowo magnes pochodzi od powincji Magnesia w
Thessalii, gdzie dosc powszechnie wystepuja
mineraly o wlasciwosciach magnetycznych.
Wystepuja takze w sasiedniej Heraklii. Sokrates
uzywal okreslenia kamien z Heraklii. Prawdopodob
nie Eurypidesowi zawdzieczamy upowszechnienie
okreslenia magnes. Gdyby przewazyla wersja
Sokratesa, to mielibysmy pole elektroheraklityczne
?
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pole magnetyczne
czym jest pole magnetyczne?
odrebnym bytem? (Faraday, Maxwell)
konsekwencja ruchu ladunku?
konsekwencja zasady wzglednosci Einsteina
transformacji Lorentza
skrócenia Fitzgeralda-Lorentza
jednym z dwóch równowaznych wcielen pola
elektromagnetycznego
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jajko czy kura
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sila Lorentza

demo dzikie wino
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sila Lorentza

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Joseph John Thomson

demo oscyloskop
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spektrometr mas

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prad elektryczny
natezenie ladunek przeplywajacy przez caly
przekrój przewodnika w jednostce czasu
gestosc pradu natezenie na jednostke
pola przekroju przewodnika

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prad elektryczny

gestosc pradu na ogól nie jest stala w calym
przekroju przewodnika!
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sila magnetyczna dzialajaca na odcinek
przewodnika z pradem
tylko gdy gestosc pradu jest stala w calym
przekroju przewodnika!

gdy
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pole magnetyczne wokól przewodnika z pradem
demo
1820 Hans Christian Ørsted
1822 Andre Marie Ampère

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Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)

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Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)
the force exerted on the test wire is directly
proportional to its length. If the current in the
test wire (i.e., the test current) flows
parallel to the current in the central wire then
the two wires attract one another. If the current
in the test wire is reversed then the two
wires repel one another. If the test current
points radially towards the central wire (and the
current in the central wire flows upwards) then
the test wire is subject to a downwards force.
If the test current is reversed then the force
is upwards. If the test current is rotated in a
single plane, so that it starts parallel to the
central current and ends up pointing
radially towards it, then the force on the test
wire is of constant magnitude and is always at
right angles to the test current.

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Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)
If the test current is parallel to a magnetic
loop then there is no force exerted on the test
wire. If the test current is rotated in a single
plane, so that it starts parallel to the central
current and ends up pointing along a magnetic
loop, then the magnitude of the force on the test
wire attenuates like cos? (where ? is the angle
the current is turned through ?0 corresponds to
the case where the test current is parallel to
the central current), and its direction is again
always at right angles to the test current the
attractive force between two parallel current
carrying wires is proportional to the product of
the two currents, and falls off like one over the
perpendicular distance between the wires.

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Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)
If the test current is parallel to a magnetic
loop then there is no force exerted on the test
wire. If the test current is rotated in a single
plane, so that it starts parallel to the central
current and ends up pointing along a magnetic
loop, then the magnitude of the force on the test
wire attenuates like cos? (where ? is the angle
the current is turned through ?0 corresponds to
the case where the test current is parallel to
the central current), and its direction is again
always at right angles to the test current the
attractive force between two parallel current
carrying wires is proportional to the product of
the two currents, and falls off like one over the
perpendicular distance between the wires.

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Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)
If the test current is parallel to a magnetic
loop then there is no force exerted on the test
wire. If the test current is rotated in a single
plane, so that it starts parallel to the central
current and ends up pointing along a magnetic
loop, then the magnitude of the force on the test
wire attenuates like cos? (where ? is the angle
the current is turned through ?0 corresponds to
the case where the test current is parallel to
the central current), and its direction is again
always at right angles to the test current the
attractive force between two parallel current
carrying wires is proportional to the product of
the two currents, and falls off like one over the
perpendicular distance between the wires.

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pole magnetyczne przewodnika z pradem
Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)

kto pamieta twierdzenie Stokesa ?
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twierdzenie Stokesa - rotacja
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pole magnetyczne przewodnika z pradem
Andre Marie Ampère Recueil dobservations
électrodynamiques (1822)

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pole magnetyczne wokól przewodnika z pradem
applet 3Dm

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linie pola
demo linie pola M

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petla z pradem
demo rzutnik 2 przewody spirala Rogeta

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koniec EMO10
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koniec EMO9