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  4. 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 :

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Q. Figure $A$ and $B$ shown two long straight wires of circular cross-section ( $a$ and $b$ with $a

JEE MainJEE Main 2021Moving Charges and Magnetism

Solution:

Graph for wire of radius $R$ :
image
As $b > a$
$B_{a}>B_{b} $
$B_{a}=\frac{\mu_{0} i}{2 \pi a} $
$B_{b}=\frac{\mu_{0} i}{2 \pi b}$