1.6 x 10⁻⁵ T is the strength of a magnetic field.
The magnetic field is the area that is affected by magnetism and is located around a magnet. The magnetic field is a useful tool for describing the distribution of the magnetic force within and around a magnetic object in nature.
i = 4 A
r = 0.05 m
At a distance r, the magnetic field caused by a long wire is given by
B = µ₀/4 π × 2i/r
B = 10⁻⁷ x 2 x 4 / 0.05
B = 1.6 x 10⁻⁵ T.
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