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A 27 mH solenoid inductor is wound on a form 0.8 m in length and 0.1...

A 27 mH solenoid inductor is wound on a form 0.8 m in length and 0.1 m in diameter. A coil is tightly wound around the solenoid at its center. The coil resistance is 7.5 Ohms. Mutual inductance of the coil and solenoid is 9.8 microH. At a given instant, the current in the solenoid is 800 mA, and is decreasing at a rate of 2.5 A/s. At a given instant the induced emf in the solenoid is closest to: (mV)

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