The S.I. unit of **mutual inductance** is the **henry (H)**.
Mutual inductance refers to the ability of one coil to induce an electromotive force (EMF) in a nearby coil when the current in the first coil changes. The mutual inductance between two coils depends on the number of turns in the coils, the distance between them, and the medium in which they are placed.
1 henry (H) is defined as the amount of inductance required to produce an EMF of 1 volt when the current changes at the rate of 1 ampere per second.