# Calculate the mutual inductance between two coils when a current of 2A changes to 6A in 2 seconds and induces an emf…

Q: Calculate the mutual inductance between two coils when a current of 2A changes to 6A in 2 seconds and induces an emf of 20 mV in the secondary coil

Sol: $\large |e| = M \frac{dI}{dt}$

$\large 20\times 10^{-3} = M \frac{6-2}{2}$

M = 10 mH