Question

The effective inductance of the circuit across the terminals A, B is _______________

(a) 9 H

(b) 21 H

(c) 11 H

(d) 6 H

This question was posed to me in exam.

I want 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 choice is (c) 11 H

The best explanation: Effective inductance across AB terminals

= L1 + L2 + L3 – 2M12 – 2M13 + 2M23

= 4 + 5 + 6 – 2(1) – 2(3) + 2(2)

= 15 + 4 – 2 – 6 = 11 H.