A)
B)
C)
D)
Correct Answer: B
Solution :
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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