Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is
Options

Question

Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is

G1 Physics · Accepted Answer

A metallic core in a moving-coil galvanometer develops eddy currents when the coil moves. By Lenz's law, these eddy currents oppose the motion of the coil and provide electromagnetic damping. Therefore the pointer comes to rest quickly without prolonged oscillation. Hence option B follows.