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Potentiometer works on which of the following principle?

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Potentiometer works on which of the following principle?

(a) variable resistance

(b) variable inductance

(c) variable capacitance

(d) variable electromagnet

The question was posed to me in exam.

This question is from Displacement, Position and Motion Transducers topic in chapter Physiological Transducers of Biomedical Instrumentation

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Correct choice is (a) variable resistance

Explanation: Potentiometer works on the principle of variable resistance. The resistance between two terminals of this device is related to the linear or angular displacement of a sliding tape along a resistance element. When the fixed terminals of the potentiometer are connected to the power supply. Either ac or dc, output voltage at the wiper varies with the displacement of the object.

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