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

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

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Measurement and Instrumentation
It can be stated that

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