In Fig. 28-51a, two concentric coils, lying in the same

Chapter , Problem 62

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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 i2 in coil 2 can be varied. Figure 28-51b gives the net magnetic moment of the two-coil system as a function of i2. The vertical axis scale is set by 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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