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(A) For a long thin hollow metallic cylinder of radius '$R$' carrying a current '$i$':$1$. Inside the cylinder $(r < R)$, there is no current enclosed

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(A) For a long thin hollow metallic cylinder of radius '$R$' carrying a current '$i$':$1$. Inside the cylinder $(r $2$. Outside the cylinder $(r \ge R)$, the cylinder acts like a long straight wire carrying current '$i$'. The magnetic field at a distance '$r$' is given by $B_{out} = \frac{\mu_0 i}{2 \pi r}$, which implies $B_{out} \propto \frac{1}{r}$.$3$. Therefore, the magnetic field is zero for $r < R$ and decreases as $1/r$ for $r \ge R$. This corresponds to the graph where $B=0$ until $r=R$ and then follows a hyperbolic decay.

$A$ long thin hollow metallic cylinder of radius '$R$' carries a current '$i$'. The magnetic induction '$B$' at a distance '$r$' from the axis varies as shown in:

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