Question

Forces between two parallel current why Fab=-Fba

Answer 1

Answer:

The force between two parallel currents I1 and I2, separated by a distance r, has a magnitude per unit length given by. Fl=μ0I1I22πr F l = μ 0 I 1 I 2 2 π r .

The force is attractive if the currents are in the same direction, repulsive if they are in opposite directions.

Hope it helps :)