Which of the following is not a ferromagnetic material? a. Iron b. Nickel c. Cobalt d. Barium
Answer: Barium
Explanation
Ferromagnetic materials are those that can retain their magnetization even after an external magnetic field is removed.
They are strongly attracted to magnets. Iron, nickel, and cobalt are all ferromagnetic materials.
Barium, on the other hand, is not ferromagnetic
It is classified as a diamagnetic material, meaning it weakly repels magnetic fields.
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