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A variable reluctance transducer senses displacement through a change in

  • A.the reluctance of a magnetic path and hence an inductance
  • B.the resistance of a coil as its temperature changes with position
  • C.the capacitance between a moving armature and a fixed plate
  • D.the charge generated when a crystal is stressed by the movement

Answer: A

Moving an iron armature alters the air gap in a magnetic circuit, and the inductance of the coil round that circuit changes accordingly. It is rugged and needs no sliding contact, and it is the principle of many pressure and vibration pickups.

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