Figure $A$ and $B$ shown two long straight wires of circular cross-section ($a$ and $b$ with $a$ $<$ $b$), carrying current $I$ which is uniformly distributed across the cross-section. The magnitude of magnetic field $B$ varies with radius $r$ and can be represented as
Diffcult
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For cylinderical wire
As $b\,>\,a$
$B_{a}\,>\,B_{b}$
$B_{a}=\frac{\mu_{0} i}{2 \pi a}$
$B_{b}=\frac{\mu_{0} i}{2 \pi b}$
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