Measurement and Instrumentation
Electrostatic instruments are normally used for

High voltage measurements
High current measurements
Low voltage measurements
Low current measurements

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Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Pressure coil of the wattmeter will become ineffective.
Both give the same readings
One of the wattmeters will read zero
One of the wattmeter connections will have to be reversed

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