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A long straight solenoid with a cross-sectional area of 6.15 cm² is wound with 46 turns of wire per centimeter, and the windings carry a current of 0.240 Amp. A secondary winding of 2 turns encircles the solenoid at its center. When the primary circuit is opened, the magnetic field of the solenoid becomes zero in 5.25 x 10^-2 second. Determine the average induced emf in secondary coil?

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