The equivalent inductance measured between the terminal

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The equivalent inductance measured between the terminal 1 and 2 for the circuit in figure—

1. L₁ + L₂ + M
2. L₁ + L₂ – M
3. L₁ + L₂ + 2M
4. L_{1_{+ L₂ – 2M}}

Correct Option: D

L_eq = L₁ + L₂ – 2M