Measurement and Instrumentation
The disc of an instrument using eddy current damping should be of

None of the listed here
Conducting and non magnetic material
Non conducting and magnetic material
Conducting and magnetic material

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

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

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