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A current is flowing through a thin cyli...

A current is flowing through a thin cylindrical shell of radius `R`. If energy density in the medium, due to magnetic field, at a distance `r` from axis of the shell is equal to `U` then which of the following graphs is correct

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
`r gt R , B = (mu_(0) i)/(2pi r)`
`U = (B^2)/(2mu_(0)) = (mu_(0) i^(2))/(8 pi^(2) r^(2)) , r gt R`
`r to oo , U to 0`
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