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Data: N = 100,R = 8 × 10-2 m, I = 0.4A, µ0 = 4π × -7 T∙m/A B = \(\frac{\mu_{0} N I}{2 R}\) = \(\frac{\left(4 \pi \times 10^{-7}\right)(100)(0.4)}{2\left(8 \times 10^{-2}\right)}\) = 3.142 × 10-4 T
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