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Why the core of a transformer is laminated

The same question, asked 2 times: 2 May 2023 S2, 15 May 2023 S2. Every wording below, oldest first.

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  1. Question 1

    2 May 2023 S2

    40
    The core used in transformers and other electromagnetic devices is laminated to

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  2. Question 2

    15 May 2023 S2

    6
    The core used in transformers are laminated to

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