When the current in one coil changes at a rate of 5.0 a/s, an emf of −4.0 ✕ 10−3 v is induced in a second, nearby coil. what is the mutual inductance of the two coils (in h)?

Explanation:

As per the condition of mutual inductance of the coil we know that flux linked with coil 2 is proportional to the current in the coil 1

so here we will have

here we know that rate of change in flux is equal to the EMF induced in the coil

so we will have

so we have

now plug in all values in it

no sign of dia of fuel cell