Discussion
Air friction damping is used in a moving iron instrument rather than eddy current damping because
Answer: D
Correct answer: its field is too weak and would be distorted by a damping disc
Eddy current damping needs a strong magnetic field for the disc to move in, and the moving iron instrument’s own field is weak. Introducing a permanent magnet for damping would distort that field and upset the reading, so a light vane moving in a sealed chamber is used instead.
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