A wedding ring is tossed into the air and given a spin, Ask an Expert

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A wedding ring is tossed into the air and given a spin, resulting in an angular velocity of 12.5 rotations per second. The rotation axis is a diameter of the ring. The magnitude of the Earth's magnetic field is 4.57·10-5 T at this location. If the maximum induced voltage in the ring is 1.028×10-6 V, what is the diameter of the ring?

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