Question

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

• A. to oscillate the coil in magnetic field for longer period of time
• B. to produce large deflecting torque on the coil
• C. to make the magnetic field radial
• D. to bring the coil to rest quickly

Hint:

Eddy currents in metallic cores are used for damping in galvanometers

Answer 1

The Correct Option is D

Step 1: Analyze the role of the metallic core.
- Anon-magnetic metallic core produces eddy currents, which create a damping force.
- This damping force brings the coil to rest quickly. 
Final Answer: The function is to bring the coil to rest quickly.