Magnetic field:

$\overline{){\mathbf{B}}{\mathbf{=}}\frac{{\mathbf{\mu}}_{\mathbf{0}}\mathbf{I}}{\mathbf{2}\mathbf{\pi}\mathbf{r}}}$

Therefore, B is proportional to 1/r

The magnetic field 10 cm from a wire carrying a 1 A current is 2 μT. What is the field 4 cm from the wire? Express your answer with the appropriate units.

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