Final answer:
The equivalent inductance at terminals a-b of the circuit is 12 mH.
Step-by-step explanation:
To determine the equivalent inductance, we need to consider the circuit configuration. If the inductor is connected in series with other inductors, the equivalent inductance can be found by simply adding up the individual inductances. However, if the inductor is connected in parallel, the equivalent inductance can be found using the formula:
1/Leq = 1/L1 + 1/L2 + 1/L3 + ...
In this case, since there is only one inductor, the equivalent inductance at terminals a-b is simply the value of the inductance given, which is 12 mH.