Current carrying conductors

  • When current flows through a conductor, charge moves from one end to the other
  • The movement of charge produces a magnetic field

Right-hand grip rule

  1. Determine the direction of conventional current
  2. Point your right thumb in the direction of the current (towards the negative)
  3. Wrap your right hand around the wire
  4. Your fingers indicate the direction of the magnetic field

Field lines for multiple conductors

  • Each conductor produces its own field lines, the total field is the sum of the two fields
  • If the arrows of the two fields point in the same direction, the field strengths add (draw tightly spaced field lines)
  • If the arrows of the two fields point in the opposite direction, the field strengths subtract (draw field lines with greater spacing)

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