The magnetic field induction on the second wire (2) due to current in the first wire is denoted by
And the force experienced on the wire 2 is given as
is the magnetic field at the second wire at point P, is the current on the wire 1, is the length of the first and the second wire respectively, is the distance between the wire is the current in the second wire, is the force experienced by the second wire on the first wire.
The definition for the one ampere is amount of current flowing in parallel conductor at a distance of d meters producing equal force of attraction and repulsion at a current of 1 ampere.
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