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Which of the following instrument can be used in ac bridges for less frequencies upto 200 Hz only?

  • Vibration galvanometer instrument can be used in ac bridges for less frequencies upto 200 Hz only.
  • A vibration galvanometer is an electromechanical instrument used to detect and measure small electric currents.
  • It works by converting the electrical current to mechanical motion using a magnetic field, which causes a thin metal strip or wire to vibrate at a frequency proportional to the current.
  • In AC bridges, vibration galvanometers are used to detect the null point or balance point of the bridge circuit.
  • The null point is the point at which the bridge is balanced, meaning that the input signal to the bridge is equal to zero. At this point, the vibration galvanometer stops vibrating, indicating that the bridge is balanced.
  • Vibration galvanometers have a limited frequency range, typically up to 200 Hz, due to their mechanical nature.
  • At higher frequencies, the mechanical components of the galvanometer cannot keep up with the rapid changes in the input signal, and the galvanometer may not provide accurate readings.
  • For higher frequencies, electronic instruments such as oscilloscopes and digital multimeters are used instead.