We wish to make an essentially flat, ring-shaped, tightly wound coil (of negligible length) with a diameter

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We wish to make an essentially flat, ring-shaped, tightly wound coil (of negligible length) with a diameter of 20.0 cm that will produce a B-field in air at its center of 9.42 μT. If we can provide 0.500 A, how many turns of wire will we need?

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