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The modification introduced by Grover into De Sauty's bridge is the addition of

  • A.a second detector so that the two balance conditions may be observed independently
  • B.an inductance in series with the standard capacitor to cancel its residual loss
  • C.a variable frequency source so that the loss angle may be measured at several frequencies
  • D.a resistance in series with each capacitor

Answer: D

Each capacitive arm becomes a capacitor with a series resistance, and adjusting those resistances satisfies the phase condition as well as the magnitude one. The bridge then also yields the difference in the loss angles of the two capacitors.

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