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

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

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Measurement and Instrumentation
It can be stated that

CT operates with a higher flux density than PT
No generalisation can be made with regard to the flux densities in CT and PT
CT operates at almost the same flux density as a PT
CT operates with considerably lower flux density than a PT

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