Magnetic field at a distance \( r \) from an infinitely long straig...

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Magnetic field at a distance \( r \) from an infinitely long straight conductor carrying steady current varies as
(1) \( 1 / r^{2} \)
(2) \( 1 / r \)
(3) \( 1 / r^{3} \)
(4) \( 1 / \sqrt{r} \)
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