Measurement and Instrumentation
It can be stated that

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

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Measurement and Instrumentation
The measurement of a quantity

 is a comparison of an unknown quantity with known quantity.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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