If current flowing through shell of previous objective is equal to $i$, then energy density at a point distance $2R$ from axis of the shell varies according to the graph
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(b) Energy density in previous objective, at $r = 2R$, will be equal to $U = \frac{{{\mu _0}{i^2}}}{{32{\pi ^2}{R^2}}}$or $U \propto {i^2}.$ It means, graph-between $U$ and $i$ will be a parabola, passing through origin, symmetric about $U$-axis and having increasing slope. Hence $(b)$ is correct.
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