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Question: an infintely long flat ribbon of width w and negligible...

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An infintely long flat ribbon of width w and negligible thickness lies in the xz plane and carries total current I in the z direction. The current is uniformly distributed across the ribbon’s width. Calculate the magnetic field at point P, a distance d from the midline of the ribbon in the plane of the ribbon, as shown. Verify that the field at d >> w is what you expect.

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