Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is (a) to bring the coil to rest quickly (b) to produce large deflecting torque on the coil (c) to oscillate the coil in magnetic field for longer period of time (d) to make the magnetic field radial

Answer: (a). When the coil moves, eddy currents are induced in the metallic core. By Lenz's law they oppose the motion, giving electromagnetic damping. So the coil comes to rest quickly (dead-beat galvanometer). Answer (a).

Certain galvanometers have a fixed core made of non magnetic metallic… | JEE Main 2023 (8 Apr, Shift 1)

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Lenz's Law, Eddy Currents & Induced Electric Field

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

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Answer: (a)

When the coil moves, eddy currents are induced in the metallic core.
By Lenz's law they oppose the motion, giving electromagnetic damping.
So the coil comes to rest quickly (dead-beat galvanometer). Answer (a).

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