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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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answer is C.

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Detailed Solution

Graph for wire of radius R :

As $b > a$

$B_{a} > B_{b}$

$B_{a} = \frac{μ_{0} i}{2 π a}$

$B_{b} = \frac{μ_{0} i}{2 π b}$

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