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Question
Two coils have inductances L1 = 1200 mH and L2 = 800 mH. They are connected in such a way that flux in the two coils aid each other and inductance is measured to be 2500 mH, then Mutual inductance between the coils is ___________ mH.
Options:
A .   225.
B .   250.
C .   145.
D .   150.
Answer: Option B

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