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Question

Write two properties of a material suitable for making
(a) a permanent magnet and
(b) an electromagnet

Solution
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Permanent Magnets:
1) High Retentivity: Magnet should be strong
2) High coercivity: Magnetisation should not get affected by stray Magnetic fields
Electromagnets:
1) High Permeability core of Iron for easy magnetisation
2) Low Retentivity: For easy magnetisation/demagnetisation.

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