Refresher Basic concept Like poles will repel Unlike poles will attract.

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FORCE ON A CURRENT CARRYING CONDUCTOR IN A MAGNETIC FIELD Cheah Hoe Leong 4S201 Law Tong Ye Matthew Edward 4S215

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Transcript of Refresher Basic concept Like poles will repel Unlike poles will attract.

Page 1: Refresher Basic concept Like poles will repel Unlike poles will attract.

FORCE ON A CURRENT

CARRYING CONDUCTOR IN A MAGNETIC FIELD 

Cheah Hoe Leong 4S201

Law Tong Ye Matthew Edward

4S215

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Refresher

Basic conceptLike poles will repelUnlike poles will attract

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Refresher

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

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Definitions

ConductorA substance, body, or system

that conducts electricity

Magnetic fieldA field of force surrounding a

permanent magnet or a moving charged particle

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When 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

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Charged particles

A charged particle moving Parallel to magnetic field

○ Not much effectPerpendicular to magnetic field

○ Experiences sideways force that is proportional to the strength of the magnetic field

○ Known as the Lorentz force

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Lorentz force

The proton is constantly deflectedMoving in circular motion

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F = BIl

F = force produced (N)

B = Flux density (T)

I = current (A)

l = length of wire in field (m)

Formula

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Flux density rate of flow of a property per unit area, which has

the dimensions [quantity]/([time]·[area])

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

 Tesla (symbol T) is SI derived unit for flux density

1 T = 1 N/AmT = teslaN = newtonA = ampere

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thumb

thrust (force)

first fingerfield

Second finger

current

Fleming’s left hand

rule

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Example

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Ways to increase the force1. Increase the current passing

through the wire Increase p.d. of power source Use wire with less resistance

○ Thicker wires○ Make from better conductors

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Ways to increase the force2. Use stronger magnets

A.K.A magnets that have a greater magnetic field strength

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Applications

The Earth's magnetic field protects us from dangerous cosmic radiation from the Sun.

Van Allen radiation belts around the Earth

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References

http://www.google.com.sg/imghp?hl=en&tab=wi

www.sparknotes.com spiff.rit.edu www.physicsforums.com www.thefreedictionary.com en.wikipedia.org farside.ph.utexas.edu

http://www.google.com.sg/imghp?hl=en&tab=wi
http://www.google.com.sg/imghp?hl=en&tab=wi
http://www.sparknotes.com/
http://www.physicsforums.com/
http://www.thefreedictionary.com/
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Thank You


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