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Image text transcribed for accessibility: Two thin circular coxial coils each of radius a, having N turns, carrying current I, and seperated by a distance d, are lettered to as Helmholtz coils for the case when d=a. This set up is well known for producing an approximately uniform magnetic field in the vicinity of its center of symmetry. Find B on the axis of symmetry-the z axis- of the Helmholtz coils. show that dBz/dz=0 at the point p midway between the two coils.

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