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Question

In a Maxwell's bridge circuit shown below,



IfR3=10Ω,C=0.5mF,R1=320ΩandR2=20Ω at balance then _____ is the Q-factor for the unknown impedance at a supply frequency of 50 Hz.
  1. 1.57

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Solution

The correct option is A 1.57
R3=10Ω, C = 0.5 mF,
R1=320Ω and R2=20Ω

By using balance conditions,

R4=R2R1R3=20×32010=640Ω

L4=R2R1C=320×20×12×103=3.2H

Q=ωL4R4=2πfL4R4=2π×50×.3.2640=1.57

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