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

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

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Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 magnitude, phase and waveform of the quantity being measured.
 both of above.
 only the magnitude of the quantity being measured.
 only phase of the quantity being measured.

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