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An infinitely long cylinderical wire of ...

An infinitely long cylinderical wire of radius R is carrying a current with current density `j=alphar^(3)` (where `alpha` is constant and r is the distance from the axis of the wire). If the magnetic fixed at `r=(R)/(2)` is `B_(1)` and at r=2R is `B_(2)` then the ratio `(B_(2))/(B_(1))` is

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