A coaxial cable having radii $a, b$ and $c$ carries equal and opposite currents of magnitude $i$ the inner and outer conductors. What is the magnitude of the magnetic induction at point $P$ outside of the cable at a distance $r$ from the axis?
Medium
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$\oint \mathrm{B} \cdot \mathrm{d} \ell=\mu_{0} \mathrm{i}_{\text {enclosed }}$
$\mathrm{i}_{\text {enclosed }}=0$
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