An infinitely long hollow conducting cylinder with radius $R$ carries a uniform current along its surface. Choose the correct representation of magnetic field $(B)$ as a function of radial distance $(r)$ from the axis of cylinder
JEE MAIN 2022, Medium
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$1)\,r < R , B _{ p }=0$
$2)\,r \geq R , B _{ p }=\frac{\mu_{0} 1}{2 \pi r }$
$B _{p} \propto \frac{1}{ I }$
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