1.

Distinguish between dia, para and ferro magnetism with examples.

Answer»
Diamagnetic materialParamagnetic materialFerromagnetic material
1. Weakly repelled by magneticWeakly attracted by magneticStrongly attracted by magnetic
2. When placed in a magnetic field it is weakly magnetized in a direction opposite to that of applied field.When placed in a magnetic field it is weakly magnetized in a direction of applied field.When placed in a magnetic field it is strongly magnetized in a direction of applied field.
3. µr is slightly less than 1µr is slightly more than 1
4. When placed in a magnetic field flux density (B) inside the material is less than in air.When placed in a external magnetic field, flux density (B) than in air.When placed in a magnetic field the flux density (B) inside the material is much large than in air.
5. Xm (susceptibility) does not change with temperature.Xm varies inversely as the temperature of substance.Xm decrease with rise temperature
6. Intensity of magnetization a small and negative value.I has small and positive value.I has large positive value.
7. Xm has small negative valueXm has small positive value.Xm has very high positive value.



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