A solenoid is to have an inductance of 0.274 mH, a cross-sectional area of 5.73 10-4 m2, and a length of 37.9 cm.
(a) How many turns per unit length should it have?
turns/m
(b) If the self-induced emf is -11.7 mV at a given time, at what rate is the current changing at that instant?
= A/s