Question

The current in a coil changes from 3.60 a to 1.80 a in the same direction in 0.490 s. if the average emf induced in the coil is 16.0 mv, what is the inductance of the coil?

Answer 1

According to Faraday's law, 

emf across inductor = L$\frac{dI}{dt}$
0.016 = L$\frac{3.6-1.8}{0.49} = 3.673$
Therefore, L = 0.016/3.673 = 4.35×10⁻³ Henry