Two long wires each carrying a d.c. current in the same direction are

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Two long wires each carrying a d.c. current in the same direction are placed close to each other. Which one of the following statements is correct?

The wires will attract each other
The wires will repel each other
There will be no force between the wires
There will be a force between the wires only at the moment when the current is switched ON or OFF
This question was previously asked in
UPSC NDA-2 – 2015
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When two parallel wires carry electric currents in the same direction, they produce magnetic fields that interact in such a way as to cause an attractive force between the wires.
This is a fundamental principle of electromagnetism: Parallel currents in the same direction attract, and parallel currents in opposite directions repel.
The force per unit length between two parallel wires carrying currents I₁ and I₂ separated by a distance r is given by F/L = (μ₀ * I₁ * I₂) / (2 * π * r), where μ₀ is the permeability of free space. The direction of the force depends on the relative direction of the currents.

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