Two parallel conductors 1 and 2 carrying current
I1 and
I2, respectively of length
l is shown in the figure given below
Force on wire 2 due to
B1 is given by
F2=I2lB1 Using right hand screw rule, direction of
F2 would be towards wire 1 .
Similarly, force on wire due to
B2 (field of wire 2)
F1=I1lB2 Again, by using right hand screw rule, direction of
F1 would be towards
2. If two parallel conductors carry (equal or unequal) current in same direction, they will exert force towards each other i.e., they will attract.
However, if these parallel conductors have current in the opposite direction then they will exert force away from each other such that they would repel.