Q. Retentivity: (Solved)
1. Represents the ability to induce magnetism in a ferromagnetic body by an outside magnetising force
2. Represents the ability of a material to resist the establishment of magnetic flux within it
3. Represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetising force has been removed
4. Is not a term used in magnetic particle testing
- c. Represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetising force has been removed