One solenoid is centered inside another. The outer one has a length of 55.0cm and contains 6800 coils, while the coaxial inner solenoid is 4.00cm long and 0.120cmin diameter and contains 18.0 coils. The current in the outer solenoid is changing at 34.0A/s.
A.) What is the mutual inductance of these solenoids? (in µH)
B.) Find the emf induced in the inner solenoid. (in V)