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For the circuit given below, the inductance measured across the terminals 1 and 2 was 15 H with open terminals 3 and 4. It was 30 H when terminals 3 and 4 were short-circuited. Both the inductors are having inductances 2H. The coefficient of coupling is ______________

For the circuit given below, the inductance measured across the terminals 1 and 2 was 15 H with open terminals 3 and 4. It was 30 H when terminals 3 and 4 were short-circuited. Both the inductors are having inductances 2H. The coefficient of coupling is ______________ Correct Answer Inderminate due to insufficient data

When 2 coils are connected in series, then effective inductance, LEFF = L1 + L2 ± 2M For this case, LEFF = L1 + L2 – 2M However, L1 + L2 + 2M or L1 + L2 – 2M cannot be determined. Hence, data is insufficient to calculate the value of coupling coefficient (k).

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