The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields______________?
Correct answer: B. a soft iron shielding is used
- A. meter is surrounded by strong magnetic fields
- B. a soft iron shielding is used
- C. a plastic shielding is provided
- D. a shielding of anon-magnetic material is used
Explanation
Soft iron provides a low-reluctance path that diverts external stray magnetic flux around the meter mechanism. Plastic and other non-magnetic shields do not effectively shunt magnetic fields.
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