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Question

Consider the following statements regarding Maxwell's bridge : 

1. Maxwell's bridge is limited to measurement of low Q inductors. 

2. The final balance equations of Maxwell's bridge are dependent of frequency. 

3. The balance equation of Maxwell's bridge is dependent of losses associated with the inductor. 

Which of the above statements is/are correct?

The correct answer is
1 and 3

To determine the correct statements regarding Maxwell's bridge, we need to analyze each statement based on the principles and characteristics of Maxwell's bridge used in electrical circuit measurement.

  1. Statement 1: Maxwell's bridge is limited to measurement of low Q inductors.

This statement is correct. Maxwell’s bridge is particularly suited for measuring inductors with low quality factor (Q). This is because the bridge configuration effectively accounts for the resistance associated with the inductor's winding resistance, providing an accurate measure for low-Q devices where resistive losses are significant.

  1. Statement 2: The final balance equations of Maxwell's bridge are dependent on frequency.

This statement is incorrect. The balance condition for Maxwell's bridge is independent of frequency. This is one of the reasons Maxwell's bridge is preferred for measuring inductances, as changes in frequency do not affect the accuracy of the balance condition.

  1. Statement 3: The balance equation of Maxwell's bridge is dependent on losses associated with the inductor.

This statement is correct. Maxwell’s bridge takes into account the resistive losses in the inductor, which affect the bridge balance condition. These losses are typically modeled as a resistance in series with the inductance, which must be balanced for accurate measurement.

Based on the analysis of the statements:

  • Statement 1 is correct as Maxwell’s bridge measures low Q inductors effectively.
  • Statement 2 is incorrect as the balance of the bridge is independent of frequency.
  • Statement 3 is correct as the bridge accounts for losses in the measured inductor.

Thus, the correct answer is 1 and 3.

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Important Questions from Measurement of R/L/C Using Bridge Circuits

  1. Megger is a measuring instrument, used for the measurement of:

  2. Which of the following bridges is used to measure dielectric loss and capacitance of dielectric material?

  3. In which of the following, vibration galvanometer, tuneable amplifier and headphones are used?

  4. How much accuracy can be obtained using Wien’s bridge?

  5. Maxwell bridge is used to measure

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