Find the coefficient of coupling between them

Posted on 2014-01-03 11:15:00 in Physics by GOGO_(:

 

The total inductance of two coils is 0.2 H when they are connected in subtractive series and 0.4H when in additive series. If the self-inductances of the coils are 0.2 H and 0.1 H, find the coefficient of coupling between them.

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