Measurement and Instrumentation
In eddy current damping, disc or former is made of a material that is a

Conductor but non magnetic
Non conductor but magnetic
Non conductor and non magnetic
Conductor but magnetic

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

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