A capacitive displacement sensor is mainly suitable for measuring
Tripura Public Service Commission - 2026,
Answer: B
A capacitive displacement sensor is mainly used for linear displacement.
The capacitance of a parallel-plate sensor is C = εA/d. Moving one plate changes the gap d or the overlap area A, so capacitance changes with position. Because it is non-contact and very sensitive, it is widely used for small linear displacements, down to nanometres, as in precision positioning and thickness gauging.
Rotary variable-area designs can measure angle, but they are a special case. Temperature and pressure are measured with a capacitive element only indirectly, by turning them into a displacement first.
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