Two circular wire rings are parallel to each other, share the same axis, are of radius a,

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Two circular wire rings are parallel to each other, share the same axis, are of radius a, and are separated by distance d, where d << a. Each ring carries current I. Find the approximate force of attraction and indicate the relative orientations of the currents.

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Engineering Electromagnetics

ISBN: 978-0073380667

8th edition

Authors: William H. Hayt, John A.Buck

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