Write two properties of a material suitable for making

(a) a permanent magnet and

(b) an electromagnet

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.