Two coils A and B have a mutual inductance 0.001 H. The current changes in the first coil according to the equation $$i = {i_0}\sin \omega t$$, where i₀ = 10A and $$\omega$$ = 10$$\pi$$ rads^$$-$$1. The maximum value of emf in the second coil is

Given that in a fluorescent lamp's choke, a reverse voltage of 120 V is generated as the choke's current changes steadily from 0.50 A to 0.20 A in a time frame of 0.030 ms. Calculate the self inductance of the choke in millihenrys (mH).