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  1. Magnetic keepers are pieces of

    2. A.

     Nickel
    B.

     Cobalt
    C.

     Steel
    D.

     Soft iron

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    Answer : Option D

    Explanation :

    Magnetic keepers are pieces of soft iron that are placed across the poles of a bar magnet or a horseshoe magnet. They help prevent the loss of magnetism.

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