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A galvanometer detects small currents and shows their direction. On which principle does it work?
AA current-carrying coil rotates in a magnetic field
BA wire heats up in proportion to the current
CA moving magnet induces a current in a stationary coil
DCharges accumulate on parallel plates
Answer & Solution
Correct answer: A. A current-carrying coil rotates in a magnetic field
1. The galvanometer has a coil between the poles of a magnet, linked to a pointer.
2. The chapter states it works on the same principle as an electric motor: a small current through the coil makes it rotate, deflecting the pointer in proportion to the current.
3. The option describes electromagnetic induction (a generator's principle), not the galvanometer's motor-like action.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.66_
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