Question

With the decrease of current in the primary coil from 2 ampere to zero value in 0.1 sec , the e.m.f generated in secondary coil is 1000 volts . The mutual inductance of the two coils is (1) 1.25 Henry (2) 2.50 Henry (3) 5.00 Henry (4) 10 Henry

Answer 1

E=L ΔI/Δt
The mutual inductance of the two coils is
L=0.1/(2-0) 100=5 H.