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The magnetic field between the poles of an electromagnet is 2.17 T. A coil of wire is placed in this region so that the field is parallel to the axis of the coil. The coil has electrical resistance 22.8 ? , radius 1.88 cm, and length 12.3 cm. When the current supply to the electromagnet is shut off, the total charge that flows through the coil is 9.15 mC. How many turns are there in the coil?

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