Question 1.23: Determine the flux density produced at a distance of 50 mm f...
Determine the flux density produced at a distance of 50 mm from a straight wire carrying a current of 20 A.
Applying the formula B=\mu _0 \ I /2\pi \ d gives:
B=\frac{12.57\times 10^{-7}\times 20}{2\times 3.142\times 50\times 10^{-3}} =\frac{251.4\times 10^{-7}}{314.2\times 10^{-3}}from which:
B=0.8\times 10^{-4} \text { tesla} \\ \text{Thus } B=80\times 10^{-6} T or B=80 μT.
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