Discuss the effect on the magnitude of the force on a current-carrying conductor

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Discuss the effect on the magnitude of the force on a current-carrying conductor of variations in:

  • the strength of the magnetic field in which it is located
  • the magnitude of the current in the conductor
  • the length of the conductor in the external magnetic field
  • the angle between the direction of the external magnetic field and the direction of the length of the conductor
  • Force is proportional to magnetic field ^B ^F
  • Force is proportional to current ^I ^F
  • Force is proportional to length ^l ^ F
  • Max at right angles to field, 0 when parallel (0°) ^θ ^F
  • Can use F = BIlSinθ to find force where F is force (N), B is magnetic field (T), l is length (m) and θ is degrees.
  • Known as motor force
  • Use right hand push rule to find direction of force (fingers – magnetic field, thumb – current, palm – force)