To calculate the equivalent impedance of the parallel inductors A, B, and C, we need to consider both the self-inductances of each inductor and their mutual inductances.
Given:
- \( L_a = 25 \, \text{H} \)
- \( L_b = 30 \, \text{H} \)
- \( L_c = 35 \, \text{H} \)
- \( M_{ab} = 10 \, \text{H} \)
- \( M_{bc} = 15 \, \text{H} \)
- \( M_{ca} = 10 \, \text{H} \)
Inductors A and B aiding means their mutual inductance contributes positively, while C