General Science • PhysicsMedium
Which of the following describes the working principle behind a moving-coil galvanometer?
A. Electromagnetic induction
B. Torque acting on a current-carrying loop in a magnetic field✓ Correct Answer
C. Heating effect of electric current
D. Seebeck thermoelectric effect
💡 Solution & Explanation
A moving-coil galvanometer operates on the mechanical principle that a current-carrying loop experiences a deflecting torque within a magnetic field. Thermoelectric or electromagnetic induction principles govern entirely different electrical instruments like thermocouples or transformers. The restoring torque counterbalances the magnetic torque to measure small electric currents accurately.
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