physics form 5 - 8.2 force acting on a current carrying conductor in a magnetic fields
TRANSCRIPT
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7/25/2019 physics form 5 - 8.2 Force Acting on a Current Carrying Conductor in a Magnetic Fields
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8.2: Force Acting on a Current-carryingConductor in a Magnetic Fields
By : Pn. Noor Syafqah Mohd
Idris
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I a current-carrying conductor isplaced in a magnetic felds theconductor will eperiences a orce.
!he interaction "etween the twomagnetic felds produce a orceon the conductor.
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#atapult feld
!he two magnetic felds in$ol$edare % Magnetic feld o the permanent magnet
Magnetic feld produced "y the current-carrying conductor
!he two magnetic felds interact to
produce a resultant feld &nown ascatapult feld as shown in fgurebelow.
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#atapult feld
!he distortion o the magnetic feld lines causesthe wire to mo$e rom the stronger magneticfeld to the wea&er feld.
'owe$er( the direction o the orce can "e easilydetermined with Flemings let-hand rule
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Flemings let-hand rule
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!"ect o #wo $arallel Current-carrying Coils in a Magnetic Field
I two current-carrying conductor isplaced in a magnetic felds( theyattract or repel each other.
!he two conductor will repel to each
other
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!he two conductor will repel to eachother
!he two conductor will attract to each
other
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#urning !"ect o a Current-carrying Coil in a MagneticField
#onsider a current-carrying coil )B#* placed "etween thepoles magnet as shown in the fgure "elow.
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)s the current +ows through the coil rom ) to *( anupward%&' orce acts on the arm #* whereas adownward %(' orce acts on the arms A) according to
Flemings *et +and rule.
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*irect current motor
) ,C motoris an electric motorthatruns on direct current*# electricity
http://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Electric_motor -
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,egree
Currentow
Arm A) Arm C, otation
/ 0esthrough
car"on"rushes
*ownward
1pward )nti-cloc&wise
2/ Nocircuit
"ro&en atcar"on"rushes
3ight 4et )nti-cloc&wise
due toinertia
56/ 0es 1pward *ownward
)nti-cloc&wise
78/ No 4et 3ight )nti-cloc&wisedue toinertia
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9actors that aect the magnitudeo the orce
Magnitude o current
Strength o electromagnetic feld
Num"er o "ar magnets Num"er o turn o coil
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)pplication - ammeter
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9actors that aect the e;ciency o a transormers
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National
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!ransmission o electrical energy throughthis ca"le will "ring to power loss as heat
energy. Power loss can "e calculate as ollow:
!he power loss can reduce "y:
i. 3educing the resistance o the ca"les
ii. 3educing the current
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