Objective : To determine the self inductance of a high quality factor unknown coil.
The Hay's bridge is a modification of Maxwell's bridge. The connection diagram is shown in Fig.1. This bridge uses a resistance in series with the standard capacitor (unlike the maxwell bridge which uses a resistance in parallel with capacitor).
Fig. 1. The circuit diagram of Hay's Bridge
and at Balance,
solving the above two equations (1) and (2) , we have ,