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Electrostatic-type instruments are primarily used as:
1. Wattmeters
2. Ohmmeters
3. Voltmeters
4. Ammeters

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Correct Answer - Option 3 : Voltmeters

The electrostatic type instrument use static electrical field to produce the deflecting torque. These types of instrument are generally used for the measurement of high voltages.

The principle of working of all electrical measuring instruments depends upon various effects of electric current or voltage as shown in the table given below.

Effect of Electricity

Type of Instrument

Suitable for

Magnetic Effect

Ammeters, voltmeters, watt meters and energy meters

D.C. and A.C Current

Electro dynamic effect

Ammeters, voltmeters, watt meters

D.C and A.C Current

Electromagnetic induction effect

Ammeters, voltmeters watt meters and energy meters

A.C Current only

Thermal effect

Ammeters, voltmeters

D.C and AC current

   Chemical Effect

  Ampere-hour meters

   D.C only

Electrostatic effect

Voltmeters

D.C and A.C current

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