A 400-turn solenoid is 25-cm long and 3.0-cm in diameter.
(a) What is the inductance of the solenoid?
(b) The solenoid is then connected a circuit as shown in the figure, where e0=24.0V, R1=6.0ohm, R2=4.0ohm, R3=8.0ohm. Find current I1, I2 and I3 immediately after the switch is first closed.
(c) Find I1, I2 and I3 after the switch is closed a long time.
(d) Finally, the switch is turned off, what is the maximum induced emf on the solenoid and the current changing rate dl/dt immediately after the switch is off?
