The formula is given by:
\[ B = \frac{{\mu_0 \cdot I}}{{2 \cdot \pi \cdot r}} \]
where:
- \( B \) is the magnetic field,
- \( \mu_0 \) is the permeability of free space,
- \( I \) is the current, and
- \( r \) is the distance from the wire.
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