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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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