Measurement and Instrumentation
Which of the following devices should be used for accurate measurement of low D.C. voltage?

Small range moving coil voltmeter
None of these
Small range thermocouple voltmeter
C. potentiometer

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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 be balanced.
 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.

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