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A pointer of an instrument once deflected returns to zero position, when the current is removed due to

  • A pointer of an instrument once deflected returns to zero position, when the current is removed due to Controlling Torque.
  • When an electrical instrument is used to measure a quantity, such as current or voltage, the instrument's moving system is deflected from its original position.
  • The deflection is caused by the deflecting torque, which is proportional to the quantity being measured.
  • The instrument's moving system is then maintained at the new position by a controlling torque, which opposes the deflecting torque.
  • When the current is removed, the deflecting torque is eliminated, and the controlling torque becomes the only torque acting on the instrument's moving system.
  • The controlling torque is designed to be such that it causes the moving system to return to its original or zero position, thus resetting the instrument for the next measurement.