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  4. Magnetic field at a distance r from an infinitely long straight conductor carrying a steady current varies as

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Q. Magnetic field at a distance $r$ from an infinitely long straight conductor carrying a steady current varies as

KCETKCET 2012Moving Charges and Magnetism

Solution:

We have $ B=\frac{\mu_{0}}{4 \pi} \cdot \frac{2 I}{r} $
$\therefore B \propto \frac{1}{r}$