Which formula would you use to find the total inductance in a series circuit?

To determine the total inductance in a series circuit, you sum the inductances of each inductor present. This means that if you have multiple inductors connected in series, the total inductance is simply the sum of their individual inductances. The formula L = L1 + L2 + L3 exemplifies this principle by indicating that for three inductors, you add their inductances together to get the total inductance (Lt).

This approach is consistent with the basic principles of series circuits, where similar components combine their effects additively. Each inductor's magnetic field interacts with the others, contributing cumulatively to the overall inductance experienced by the circuit.

While other options suggest different mathematical operations (like multiplication or division), they do not apply to how inductors function together in series. In series configurations, it’s the additive property of inductance that correctly describes how to calculate the total inductance for the circuit.