The correct answer is: Inductive.
A LVDT (Linear Variable Differential Transformer) is a type of inductive transducer that converts linear displacement into an electrical signal. It consists of a primary coil, two secondary coils, and a ferromagnetic core. The core is movable and is positioned between the primary and secondary coils. When an alternating current is applied to the primary coil, a magnetic field is created. This magnetic field induces a voltage in the secondary coils. The voltage in the secondary coils is proportional to the position of the core.
Magneto-strictive transducers convert mechanical motion into electrical signals by using the magnetostrictive effect. This effect is the property of some materials to change their shape when they are subjected to a magnetic field. Magneto-strictive transducers are used in a variety of applications, including position sensors, accelerometers, and strain gauges.
Resistive transducers convert mechanical motion into electrical signals by using the change in resistance of a material when it is deformed. Resistive transducers are used in a variety of applications, including position sensors, force sensors, and pressure sensors.
Eddy current transducers convert mechanical motion into electrical signals by using the eddy current effect. This effect is the generation of eddy currents in a conductor when it is placed in a changing magnetic field. Eddy current transducers are used in a variety of applications, including position sensors, speed sensors, and vibration sensors.