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How many coils are required to make LVDT?

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How many coils are required to make LVDT?

(a) 4

(b) 6

(c) 3

(d) 2

The question was asked in an international level competition.

This interesting question is from Optical Fiber Sensors in division Physiological Transducers of Biomedical Instrumentation

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Best answer
The correct answer is (c) 3

The best I can explain: Total 3 coils are required in LVDT. One centered coil which is the energizing or primary coil connected to the sine wave oscillator. The other two coils are the secondary coils so connected that their outputs are equal in magnitude but opposite in phase.

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