Magnetic Force Between Current-Carrying Wires Calculator

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Choose which quantity to solve for. All others become inputs.
Parallel currents in the same direction attract each other; opposite directions repel.
Magnitude of the current in the first wire in amperes.
A
Magnitude of the current in the second wire in amperes.
A
Centre-to-centre distance between the two parallel wires.
Unit for displaying the force per unit length result.
Force per unit length (F/L)Attractive
4.0000e-4 N/m

Magnetic force per metre of wire length

InteractionAttractive (same direction)
Magnetic field at wire 2 (from wire 1)4.0000e-5 T
_fpl_raw0.0004
Force per unit length (N/m)0.0004

Force per unit length: 4.0000e-4 N/m (attractive).

  • Both currents are equal (10 A), so increasing either current by the same factor multiplies the force by that factor squared.
  • The wires carry current in the same direction, so the magnetic fields between them partially cancel, drawing the wires together.
  • Force per unit length is inversely proportional to distance: halving the separation doubles the force.

Next stepTo find the force on a specific section of wire, switch the mode to "Total force on a wire segment" and enter the length.

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