ELECTROMAGNETISM Force between current-carrying conductors.
FORCE BETWEEN TO WIRES
The force on moving charge is given by F = B I l sin( O ) (from here), the
strength of the field, the magnetic flux density is given by B = u0 I / 2 πa
(from here), so combining the two equations the force one exerts on the other is
F = u0 I1I2 L/ 2 πa
where I1 is the currant in one, I2 is the currant in the other, L is the Length of the wires that are parallel,
a is the separation between them and u0 is the permeability.
Note:
- If the currents are both in the same direction then the force is pushing them together, if they are in opposite directions
then they push each other apart.
Rob Coles 29 May 1996 09:55:58