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What advantage is there in using a set of helmholtz coils over just a single small magnet?
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What advantage is there in using a set of helmholtz coils over just a single small magnet?

User Jterm
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Two parallel coils separated by a distance equal to the radius of the coils are known as Helmholtz coils. They are frequently used because they generate a magnetic field that is uniform over an appreciable region about its midpoint.
User Riva
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