A large research solenoid has a self-inductance of 2.5 H. What is the magnitude of the emf, in kilovolts, that opposes shutting off a current of 95 A through the solenoid, in 77.5 ms? How much energy in joules is stored in the inductor at full current? At what rate, in megawatts, must energy be dissipated when the full current is switched off in 77.5 ms?