The instrument used for detecting the presence of electric current in

by

The instrument used for detecting the presence of electric current in a circuit is

Refractometer
Galvanometer
Viscometer
Diffractometer
This question was previously asked in
UPSC NDA-2 – 2020
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The correct answer is (B) Galvanometer.
A galvanometer is an electrical instrument used for detecting the presence of electric current in a circuit and also for measuring its direction and magnitude (although ammeters are typically used for precise magnitude measurement).
A refractometer is used to measure the refractive index of a substance. A viscometer is used to measure the viscosity of a fluid. A diffractometer is used to study the diffraction of radiation (like X-rays or electrons) by a material, often to determine its crystal structure.

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