22. mutual inductance
a & d.
In order to have mutual inductance, there must be a changing magnetic field. An a-c voltage produces a
constantly changing magnetic field.
Q. Under what conditions can a d-c voltage produce a changing magnetic field?
The mutual inductance between two coils is determined by two factors:
(1) The inductance of the coils in henrys, and
(2) The coefficient of coupling between the two coils.