The formula is given by:
\[
F/L = \frac{\mu_0 I_1 I_2}{2\pi d}
\]
where:
- \( F/L \) is the magnetic force per unit length,
- \( \mu_0 \) is the permeability of free space (\( 4\pi \times 10^{-7} \, \text{T m/A} \)),
- \( I_1 \) and \( I_2 \) are the currents in
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