motor effect

• • current in magnetic field experiences a force
• • when a current-carrying wire is between magnetic poles, the magnetic field interacts with the magnetic field it's placed in
  • causes magnetic conductor to exert a force on each other- this is called the MOTOR EFFECT & causes the wire to move

  A) wire

  B) deviated

  
• • to experience a full force, wire has to be 90° to the magnetic field
  • if wire is PARALLEL, it won't experience a force
  • force always acts at right angles to the magnetic field & direction of current
  • a good way to show direction of force is to apply a current to a set of rails inside of a horseshoe magnet; bar is placed on rails which completes the circuit & generates a force that rolls the bar along the rails
• • magnitude (strength) of force increases with strength of magnetic field
  • force also increases with the amount of current passing through conductor
• • force on conductor depends on 3 things..

  1. magnetic flux density - how many field (flux) lines there are, showing the strength
  2. size of current through the conductor
  3. length of conductor in magnetic field
• F = BIl

  • F= force, N
  • B = magnetic flux density, T tesla
  • I = current, A
  • l = length, m
  • when current is at 90° to magnetic field, we can use this equation to find the force acting on it
• what does a current in a magnetic field experience?

  force