(i) Write two characteristics of a material used for making permanent magnets.
(i) Write two characteristics of a material used for making permanent magnets.
(ii) Why is core of an electromagnet made of ferromagnetic materials?
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(i) For permanent magnet the material must have high retentivity and high coercivity (e.g., steel).
(ii) Ferromagnetic material has high retentivity, so when current is passed in ferromagnetic material it gains sufficient magnesium immediately on passing a current through it.
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