Two thin long parallel wires, separated by a distance $d$ carry a current of $I$ $amp$ in the same direction. They will
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$F=\mu_{0} \frac{\mathrm{I}^{2} \mathrm{L}}{2 \pi \mathrm{d}}$
Where $\mathrm{L}$ is the overlapping length. Two long parallel conductor carrying currents in the same direction attract each other.
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