Which meter is used in electromagnet damping? 

A flux meter is used in electromagnet damping.

Torque in measuring instruments

Following are the types of torque produced in measuring instruments.

1.) Deflecting torque

• This torque causes the pointer to move from its initial (zero) position.
• To obtain this force in an instrument, different effects of electric current are used such as magnetic effect, heating effect, chemical effect, etc.

2.) Controlling torque

• The controlling force always acts in opposite direction to the deflecting force.
• This torque returns the pointer to its initial zero position when the instrument is disconnected from the supply.
• The controlling force could be produced by spring or gravity control.

3.) Damping torque

• This torque is necessary to bring the pointer to rest in its final deflected position quickly.
• Without such damping, the combination of deflecting torque and controlling torque makes the pointer oscillate about its final deflected position for some time.
• The methods to produce damping torque in different instruments are: