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Here is this issue's question for the experts at API Delevan.
 
Q. How do I determine the Coupling Coefficient between 2 inductors?
 
 
A. Use the following formula:
 
Where:
M is mutual inductance
L1 is inductance of first inductor
L2 is inductance of second inductor
M, L1 & L2 are expressed in same units
 
Note: API Delevan, Inc. provides this formula as a general reference source of information only and does not assume responsibility for the use or accuracy of the information