62 -o In Fig. 28-51a, two concentric coils, lying in the same plane, carry currents in opposite directions. The current in the larger coil 1 is fixed. Current 

 in coil 2 can be varied. Figure 28-51b gives the net magnetic moment of the two-coil system as a function of 

, and the horizontal axis scale is set by 

. If the current in coil 2 is then reversed, what is the magnitude of the net magnetic moment of the two-coil system when 

28.P.62

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28.P.62

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