Final answer:
The equivalent inductance seen by ports can be found by calculating the total inductance of the circuit, either by summing the individual inductances in series or using the formula for parallel inductances.
Step-by-step explanation:
The equivalent inductance seen by ports can be found by calculating the total inductance of the circuit. If the circuit has multiple inductors connected in series, the equivalent inductance is found by summing the individual inductances. If the circuit has multiple inductors connected in parallel, the equivalent inductance is found by using the formula 1/L equivalent = 1/L1 + 1/L2 + ... + 1/Ln.
For example, if a circuit has three inductors L1, L2, and L3 in series, the total inductance seen by the ports would be L equivalent = L1 + L2 + L3. If the same circuit has three inductors L1, L2, and L3 in parallel, the total inductance seen by the ports would be 1/L equivalent = 1/L1 + 1/L2 + 1/L3.