Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit to maximum extent.
 It loads the circuit moderately.

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

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