Curves in the graph shown in figure give, as functions of radius distance \( r \), the magnitude...

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Curves in the graph shown in figure give, as functions of radius distance \( r \), the magnitude \( B \) of the magnetic field inside and outside four long 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.
Which wire has the greatest radius?
(1) \( a \)
(2) \( b \)
(3) \( c \)
(4) \( d \)
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