Q. 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
A)
B)
C)
D)
Explanation
(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
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.