force on a current carrying conductor in a magnetic field
DESCRIPTION
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 PresentationTRANSCRIPT
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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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Refresher Basic concept
Like 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 Conductor
A 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 effect
Perpendicular 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 deflected
Moving 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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thumbthrust (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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ApplicationsThe 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
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Thank You