The magnetic field \( B \) at the center of a circular arc carrying current \( I \) is given by:
\[ B = \frac{\mu_0 I \theta}{4 \pi r} \]
where \( \mu_0 = 4\pi \times 10^{-7} \, \text{T}\cdot\text{m/A} \) is the permeability of free space, \( \theta \) is the
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