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The chief practical drawback of Anderson's bridge is that

  • A.it cannot be used for coils whose quality factor is smaller than about ten
  • B.the detector must be a vibration galvanometer tuned to the supply frequency
  • C.its balance equations are complicated and the adjustments interact
  • D.it requires a standard capacitor that is continuously variable over a wide range

Answer: C

The extra branch makes the two balance conditions interdependent, so a change made for one disturbs the other and convergence is slow. Set against that, only a fixed capacitor is needed and low-Q coils are measured accurately, which is why the bridge survives.

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