Maxwell bridge
= Maxwell bridge
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{wiki}
A null <electrical circuit> for measuring a lossy <inductor> against a standard <capacitor>. If opposite arms are $R_x+i\omega L_x$ and $(1/R_1+i\omega C)^{-1}$, and the remaining arms are $R_2,R_3$, balance requires their products to agree. Consequently $R_x=R_2R_3/R_1$ and $L_x=CR_2R_3$. Two independent real adjustments are necessary; changing the source <frequency> does not change the ideal balance conditions.