Given
l = 1.8 amp
L = 3.8 mm = 3.8 x 10-3 m
r = (0, 3.8, 4.6 m)
We can use Biot - Savart law
B = μ/4π x (lLsin(θ)/r2)
where sin(θ ) is angle between position vector and current element
For r = 0 iPLEASE
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