Question

For the circuit given below, the effective inductance of the circuit across the terminal AB is ___________

(a) 9 H

(b) 21 H

(c) 11 H

(d) 6 H

I got this question in quiz.

I'd like to ask this question from Advanced Problems on Magnetically Coupled Circuits topic in division Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

The correct answer is (c) 11 H

The best explanation: LEFF across AB = L1 + L2 + L3 – 2M12 – 2M13 + 2M23

= (4 + 5 + 6 – 2 × 1 -2 × 3 + 2 × 2)

= (15 – 2 – 6 + 4)

= (15 – 8 + 4)

= (15 – 4)

= 11.