Measurement and Instrumentation
Electrostatic instruments are normally used for

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

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

  Period and frequency measurement modes respectively.
 Period measurment modes only.
 Frequency and period measurment modes, respectively.
 Frequency measurment modes only.

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