The differential coupling of two coils in series connection has self-inductance of 2 mH & 4 mH & a mutual ...

The differential coupling of two coils in series connection has self-inductance of 2 mH & 4 mH & a mutual inductance of 0.15 mH. The equivalent inductance of the combination is: 


(A) 5.7 mH (B) 5.85 mH (C) 6 mH (D) 6.15 mH
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