Curves in the graph shown give, as functions of radial distance \( r \) (from the axis), the mag....

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Curves in the graph shown give, as functions of radial distance \( r \) (from the axis), the magnitude \( B \) of the magnetic field (due to individual wire) inside and outside four long
P
wires \( a . b \). c and d. carrying currents that are uniformly distributed across the cross sections of the wires. Overlapping portions of the plots are indicated by double labels. All curves start from the origin.

Which wire has the greatest radius?
(1) a
(2) \( b \)
(3) \( \mathrm{c} \)
(4) \( d \)


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