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Which of the following types of instrument can be used for D.C only?

  • Permanent magnet types of instrument can be used for D.C only.
  • Permanent magnet instruments are primarily designed for measuring DC quantities because the interaction between the magnetic field produced by the permanent magnet and the magnetic field produced by the current flowing through the instrument results in a deflecting torque on the moving coil or other deflecting element in the instrument.
  • In DC measurements, the current flows in one direction, and the deflecting torque is proportional to the magnitude of the current.