The core of a moving iron instrument is made up of permalloy to
- A. Increase sensitivity
- B. Reduce temperature effect
- C. Reduce effect of stray magnetic field
- D. Reduce the size of the instrument
Answer: C. Reduce effect of stray magnetic field
Explanation: Permalloy (high nickel-iron alloy) has extremely high magnetic permeability and negligible hysteresis loss, shielding moving-iron vanes from stray magnetic fields and minimizing hysteresis errors.