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Force on a current carrying conductor in a magnetic field 

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

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Force on a current carrying conductor in a magnetic field 

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  1. Cheah Hoe Leong 4S201 Law Tong Ye Matthew Edward 4S215 Force on a current carrying conductor in a magnetic field 

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

  3. Refresher • When a currentis passed through a conductor, a magnetic field is produced • Right hand grip

  4. Definitions • Conductor • A substance, body, or system that conducts electricity • Magnetic field • A field of force surrounding a permanent magnet or a moving charged particle

  5. 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

  6. 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

  7. Lorentz force • The proton is constantly deflected • Moving in circular motion

  8. Formula F = BIl F = force produced (N) B = Flux density (T) I = current (A) l = length of wire in field (m)

  9. 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/Am T = tesla N = newton A = ampere

  10. Fleming’s left hand rule thumb thrust (force) firstfinger field Second finger current

  11. Example

  12. Ways to increase the force • Increase the current passing through the wire • Increase p.d. of power source • Use wire with less resistance • Thicker wires • Make from better conductors

  13. Ways to increase the force • Use stronger magnets • A.K.A magnets that have a greater magnetic field strength

  14. Applications The Earth's magnetic field protects us from dangerous cosmic radiation from the Sun. Van Allen radiation belts around the Earth

  15. 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

  16. Thank You

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