To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?
Correct answer: A. magnetic screening
- A. magnetic screening
- B. Wagner earthing device
- C. wave filters
- D. any of the above
Explanation
Magnetic screening surrounds the bridge or sensitive components with a magnetic shield, preventing external stray fields from inducing errors. Wagner earthing is used mainly against electrostatic coupling, not magnetic fields.
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