Which of the following graphs correctly represents the variation of magnetic field with distance $R$ from a long straight current carrying conductor ?
A$A$
B$B$
C$C$
D$D$
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D$D$
d $B=\frac{\mu_{0} I}{2 \pi r}$
$\boxed{{\text{B}} \propto \frac{1}{{\text{r}}}}$
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