In Figure a, two concentric coils, lying in the same plane, carry currents in opposite directions. The current in the larger coil 1 is fixed. Current i2 in coil 2 can be varied. Figure b gives the net magnetic moment of the two-coil system as a function of i2. The vertical axis scale is set by μ net, s = 2.0 x 10-5 A ?? m2, and the horizontal axis scale is set by i2s = 10.0 mA. If the current in coil 2 is then reversed, what is the magnitude of the net magnetic moment of the two-coil system when i2 = 7.0 mA?

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Hnet.s 10 -Het.s 1. ig (mA) (6) (a) Huer (10 A• m)