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The AC bridge shown in the figure is used to measure an unknown inductance connected in CD arm. The bridge can be balanced by
  • a)
    placing a resistor of 5000Ω in parallel with capacitor
  • b)
    placing a capacitor of reactance 100Ω in series with resistor R3
  • c)
    placing a resistor of 2000Ω in parallel with capacitor
  • d)
    Both (1) and (2)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The AC bridge shown in the figure is used to measure an unknown induc...
First we balance phase angles. We know that to balance the bridge, the sum of phase angle of opposite arms must be equal. From the figure
The first option is to modify impedance of branch AB(ZAB) so that its phase angle is decreased to less than 900 (equal to ፀCD) by placing a resistor in parallel with the capacitor as shown in the figure
Condition for balance
where
Substituting above values, we get
and
The second option is to modify the phase angle of arm AD by adding a series capacitor, as shown in the figure
Balancing condition
Substituting the value in above equation, we have
or Xc = 200Ω
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The AC bridge shown in the figure is used to measure an unknown inductance connected in CD arm. The bridge can be balanced bya)placing a resistor of 5000Ω in parallel with capacitorb)placing a capacitor of reactance 100Ω in series with resistor R3c)placing a resistor of 2000Ω in parallel with capacitord)Both (1) and (2)Correct answer is option 'A'. Can you explain this answer?
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The AC bridge shown in the figure is used to measure an unknown inductance connected in CD arm. The bridge can be balanced bya)placing a resistor of 5000Ω in parallel with capacitorb)placing a capacitor of reactance 100Ω in series with resistor R3c)placing a resistor of 2000Ω in parallel with capacitord)Both (1) and (2)Correct answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The AC bridge shown in the figure is used to measure an unknown inductance connected in CD arm. The bridge can be balanced bya)placing a resistor of 5000Ω in parallel with capacitorb)placing a capacitor of reactance 100Ω in series with resistor R3c)placing a resistor of 2000Ω in parallel with capacitord)Both (1) and (2)Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The AC bridge shown in the figure is used to measure an unknown inductance connected in CD arm. The bridge can be balanced bya)placing a resistor of 5000Ω in parallel with capacitorb)placing a capacitor of reactance 100Ω in series with resistor R3c)placing a resistor of 2000Ω in parallel with capacitord)Both (1) and (2)Correct answer is option 'A'. Can you explain this answer?.
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