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An aluminum ring with a radius of 5.00 cm and a resistance of 2.85 10-4 is...

An aluminum ring with a radius of 5.00 cm and a resistance of 2.85 10-4 is placed on top of a long air-core solenoid with 1030 turns per meter and radius of 3.00 cm, as shown in Figure P31.7. Assume the axial component of the field produced by the solenoid over the area of the end of the solenoid is one-half as strong as at the center of the solenoid. Assume that the solenoid produces negligible field outside its cross-sectional area. (a) If the current in the solenoid is increasing at a rate of 270 A/s, what is the induced current in the ring? A (b) At the center of the ring, what is the magnetic field produced by the induced current in the ring? µT (c) What is the direction of this field?

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