Question

The magnetic field 40.0 cm away from a long, straight wire carrying current 2.00 A is 1.00 μT\mu \mathrm { T }. At what distance is it 0.100 μT\mu \mathrm { T }?

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In this problem, we are given that a current-carrying wire has current I=2.00 AI = 2.00~\mathrm{A}. At a distance r1=40.0 cm=0.400 mr_{1} = 40.0~\mathrm{cm} = 0.400~\mathrm{m}, the magnetic field is B1=1.00 μTB_{1} = 1.00~\mathrm{\mu T}. We calculate the distance such that the magnetic field is B2=0.100 μTB_{2} = 0.100~\mathrm{\mu T}.

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