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

Asked in JEE Main 8th April 1st Shift 2023 · Eddy currents and damping

• (1) to produce large deflecting torque on the coil
• (2) to make the magnetic field radial
• (3) to oscillate the coil in magnetic field for longer period of time
• (4) to bring the coil to rest quickly

Step-by-step solution

Why the other options are wrong

• (1) comes from the deflecting torque comes from the current in the coil, not the core
• (2) comes from radial field is the job of the concave pole pieces, not the core
• (3) comes from damping shortens the oscillation, it does not prolong it

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