Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

Conducting and magnetic material
Non conducting and magnetic material
Conducting and non magnetic material
None of the listed here

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

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

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