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Magnetic shielding: the instrument is surrounded by a soft ferromagnetic substance

The same question, asked 2 times: 13 May 2024 S2, 25 Apr 2025 S2. Every wording below, oldest first.

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  1. Question 1

    13 May 2024 S2

    16
    Magnetic shielding is done by surrounding the instrument to be protected from magnetic field by

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  2. Question 2

    25 Apr 2025 S2

    50
    To protect the instrument from magnetic field, it is completely surrounded by

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