A66-mh solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. a coil is tightly wound around the solenoid at its center. the coil resistance is 7.7 ohms. the mutual inductance of the coil and solenoid is 34 µh. at a given instant, the current in the solenoid is 810 ma, and is decreasing at the rate of 2.5 a/s.

a) the number of turns in the winding of the solenoid is?
b) at the given instant, the induced emf in the solenoid is?
c) at the given instant, the magnetic energy of the solenoid, in