Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

Most be of low temperature co-efficient
Should non magnetic
All of the listed here
Should have low specific resistance

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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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