types of controlling torque
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Explanation:
The deflecting torque is produced by utilizing one or more of the following effects of current or voltage:
Magnetic effect
Moving-iron instruments.
Electrodynamic effect
(i) Moving coil instruments,
(ii) Dynamometer type.
Electromagnetic induction effect
induction type instruments.
Thermal effect
Hot-wire instruments.
Chemical effect
Electrolytic instruments.
Electrostatic effect Electrostatic voltmeters
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