ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 1
in coil 2. This current in coil 2 is produced by the collapsing
magnetic field of coil 1.
(1) Factors Affecting Mutual Inductance. The mutual
inductance of two adjacent coils is dependent upon the physical
dimensions of the two coils, the number of turns in each coil,
the distance between the two coils, the relative positions of
the axes of the two coils, and the permeability of the core.
FIGURE 23. MUTUAL INDUCTANCE.
(2) Coefficient of Coupling. The COEFFICIENT OF COUPLING
between the two coils is equal to the ratio of the flux cutting
one coil to the flux originated in the other coil. If the two
coils are so positioned with respect to each other that all of
the flux of one coil cuts all the turns of the other, the coils
are said to have a unity coefficient of coupling. It is never
exactly equal to unityone, but it approaches this value in
certain types of coupling devices. If all the flux produced by
one coil cuts only half the turns of the other coil, the
coefficient of coupling is 0.5. The coefficient of coupling is
designated by the letter K.
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