24. In the one case we have Bsmall+ Bbig= 47.25 µT, and the other case gives Bsmall– Bbig= 15.75 µT (cautionary note about our notation: Bsmallrefers to the field at the center of the small-radius arc, which is actually a bigger field than Bbig!). Dividing one of these equations by the other and canceling out common factors (see Eq. 29-9) we obtain
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