magnetic force between two parallel current carrying wire

Magnetic Force Between Two Parallel Wires
When two long, straight wires are placed parallel to each other and carry currents
F experienced by each wire due to the other can be found using the following formula:
F=μ0/2πI1I2d
d is the distance between the wires.
Direction of the Force
The force is attractive if the currents are in the same direction (parallel currents) and repulsive if the currents flow in opposite directions.

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