Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge is balanced for some specified value of frequency.
 The bridge can be balanced.
 The bridge can not be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 None of above.
 The precision in measurment is independent of the type of the defector used.
 It is possible to standardize before a measurement is undertaken.
  It is based on null balance technique.

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