Retentivity And Coercivity

For making the electromagnets the retentivity and permeablity of the material should be respectively

Distinguish between the magnetic properties of dia, para and ferromagnetic substances in terms of (i) susceptibility (ii) magnetic permeability and (iii) Coercivity. Give one example of each of these materials. Draw the field lines due to an external magnetic field near a (i) diamagnetic (ii) paramagnetic substance.

Retentivity is high in the case of ________

STATEMENT-1 : Hard ferromagnetic materials are used for data storage . and STATEMENT-2 : Retentivity of hard ferromagnetic materials is very small .

Enantiomers|Retention|Inversion, Retention And Racemisation|Stereochemical Aspects Of SN2 Reaction|Stereochemical Aspects Of SN1 Reaction|Summary

Assertion (A): Electromanetism is relativistic Reason (R ): Coercivity of soft iron is small.

Assertion: Electromagnets are made of soft iron. Reason: Coercivity of soft iron is small.

A bar magnet having coercivity 4 xx 10^(3) Am^(-1) is demagnetised by inserting it inside a solenoid 10 cm long and having 50 turns. The current that should be sent through the solenoid is