How do dia- and ferro-magnetic materials behave when kept in a uniform
external (magnetic) field? Give one example of each of these materials.
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In dia-magnetic materials, magnetic field lines are repelled. When placed in a non-uniform magnetic field the material moves from stronger field to weaker field. When placed in uniform magnetic field, its longest dimension is aligned perpendicular to the field. examples are copper, gold, water etc.
Ferromagnetic material (iron) have a strong magnetic susceptibility which means that any external magnetic field find and easy path through them because inner magnetic dipoles does align and reinforce that field due to magnetization, strong attraction forces are developed due to field reinforcing.
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