Force on a current carrying conductor in a magnetic field 

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Cheah Hoe Leong 4S201 Law Tong Ye Matthew Edward 4S215. Force on a current carrying conductor in a magnetic field . Refresher. Basic concept Like poles will repel Unlike poles will attract. Refresher. When a current is passed through a conductor, a magnetic field is produced - PowerPoint PPT Presentation

Text of Force on a current carrying conductor in a magnetic field 

Force on a current carrying conductor in a magnetic field

Force on a current carrying conductor in a magnetic fieldCheah Hoe Leong 4S201 Law Tong Ye Matthew Edward 4S215

Refresher Basic conceptLike poles will repelUnlike poles will attract

RefresherWhen a current is passed through a conductor, a magnetic field is producedRight hand grip

DefinitionsConductorA substance, body, or system that conducts electricity

Magnetic fieldA field of force surrounding a permanent magnet or a moving charged particleWhen a movable current carrying wire is placed in a magnetic field it will experience a force and the wire will move/ jump out of the field.This is known as the motor effect

Charged particlesAcharged particlemoving Parallel to magnetic fieldNot much effectPerpendicular to magnetic fieldExperiencessidewaysforce that is proportional to the strength of the magnetic fieldKnown as theLorentz force

Lorentz forceThe proton is constantly deflectedMoving in circular motion

F = BIlF = force produced (N)B = Flux density (T)I = current (A)l = length of wire in field (m)FormulaFlux densityrate of flow of a property per unit area,which has thedimensions[quantity]/([time][area])

Rate of flow of electric current through per unit area of the cross-sectional area of the conductor

Tesla(symbolT) is SI derived unit for flux density

1 T = 1 N/Am

T = teslaN = newtonA = ampere

thumbthrust (force)first fingerfieldSecond fingercurrentFlemings left hand ruleExample

Ways to increase the forceIncrease the current passing through the wireIncrease p.d. of power sourceUse wire with less resistanceThicker wiresMake from better conductors

Ways to increase the forceUse stronger magnetsA.K.A magnets that have a greater magnetic field strength

ApplicationsThe Earth's magnetic field protects us from dangerouscosmic radiation fromthe Sun.

Van Allen radiationbelts around the EarthReferenceshttp://www.google.com.sg/imghp?hl=en&tab=wi www.sparknotes.comspiff.rit.eduwww.physicsforums.comwww.thefreedictionary.comen.wikipedia.orgfarside.ph.utexas.edu

Thank You

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