A long solenoid of length 7.0 x 10^-2 meters and cross-sectional area of 4.0 x 10^-5 meters^2 contains 6200 turns per meter.
a) Find the self-inductance of the solenoid, assuming the core is air.
b) Determine the emf induced in the solenoid when the current increases from 0 to 1.2A in a time of 0.30 seconds.
c) Find the energy stored in the solenoid after 3 seconds?