The couple developed in the suspension wire and the loose spring in a suspension type of moving coil galvanometers called :

Deflecting couple

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Restoring couple

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Twisting couple

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None of these

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Solution

The correct option is B Restoring couple
The restoring couple sets the needle galvanometer in motion and the scale on the galvanometer is marked accordingly.

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Similar questions

Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.

Moving coil galvanometers are of two types
(a) Suspended coll
(b) Pivoted coil type or tangent galvanometer,

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.

$(i i i)$ The deflection in a moving coil galvanometer is