Question 76: Electromagnetic Induction

Question

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

Accepted Answer

The function of the non-magnetic metallic core in a galvanometer is to provide a path for the induced current generated by the moving coil in the magnetic field. This induced current opposes the motion of the coil and brings it to rest quickly due to the effect known as eddy current damping.
When the coil swings past its equilibrium position, a change in magnetic flux occurs. According to Faraday's law of electromagnetic induction, this change in magnetic flux generates an induced current, known as an eddy current. The eddy current creates its own magnetic field which opposes the original change in flux, causing the coil to quickly come to rest.

Answer

to bring the coil to rest quickly

Answer

to produce large deflecting torque on the coil

Answer

to oscillate the coil in magnetic field for longer period of time

Answer

to make the magnetic field radial

Electromagnetic Induction

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

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