The strength of the magnetic field at a point $r$ near a long straight current carrying wire is $B$. The field at a distance $\frac{r}{2}$ will be
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(c) $B \propto \frac{1}{r} \Rightarrow \frac{{{B_1}}}{{{B_2}}} = \frac{{{r_2}}}{{{r_1}}} \Rightarrow \frac{B}{{{B_2}}} = \frac{{r/2}}{r} \Rightarrow {B_2} = 2B$
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