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N = 300 turns of thin wire are uniforml...

`N = 300` turns of thin wire are uniformly wound on a permanent magnet shaped as a cylinder whose length is equla to `l = 15 cm`. When a current `I = 3.0 A` was passed through the wring the field outside the magnet disappeared. Find the coercive force `H_(e)` of the materail from which the magnet was manufaucured.

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