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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