Figure A and B shown two long straight wires of circular cross-section

Question:

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


Correct Option: , 3

Solution:

Graph for wire of radius R :

As $b>a$

$\mathrm{B}_{\mathrm{a}}>\mathrm{B}_{\mathrm{b}}$

$\mathrm{B}_{\mathrm{a}}=\frac{\mu_{0} \mathrm{i}}{2 \pi \mathrm{a}}$

$\mathrm{B}_{\mathrm{b}}=\frac{\mu_{0} \mathrm{i}}{2 \pi \mathrm{b}}$

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