Q17 of 44 Page 202

Answer the following question:

‘A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory?’ Explain the meaning of this statement.

The record of hysteresis loop cycles during magnetization (i.e. value of magnetization) corresponds to bits of information. Therefore, the material displaying hysteresis loops like a ferromagnet can be used for storing information.


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17

Answer the following question:

Explain qualitatively on the basis of domain picture the irreversibility in the magnetization curve of a ferromagnet.

 17

Answer the following question:

The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetization, which piece will dissipate greater heat energy?

 17

Answer the following question:

What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building ‘memory stores’ in a modern computer?

 17

Answer the following question:

A certain region of space is to be shielded from magnetic fields. Suggest a method.