A very long straight wire carries a current 5.2 A. What is the magnitude of the magnetic field at a distance 3.1 cm from the wire? [ µ0 = 4π × 10-7 T∙m/A]
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Data : I = 5.2 A, a = 0.031 m, \(\frac{\mu_{0}}{4 \pi}\) = 10-7 T∙m/A The magnetic induction, B = \(\frac{\mu_{0} I}{2 \pi a}=\frac{\mu_{0}}{4 \pi} \frac{2 I}{a}\) = 10-7 × \(\frac{2(5.2)}{3.1 \times 10^{-2}}\) = 3.35 × 10-5 T
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